NWT developed the PWR/Q-CHEM program in late 1984 in order to provide utilities with a technique to validate their analytical procedures and to assess their laboratory capabilities relative to those of other utilities by analysis of blind samples. NWT developed BWR/Q-CHEM in mid-1987 to provide a similar service for BWRs. Both programs are supportive of the objectives outlined in ASTM International E691-14, “Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method”, ASTM International E1323-09, “Standard Guide for Evaluating Laboratory Measurement Practices and the Statistical analysis of the Resulting Data”, ASTM International E1763-06, “Standard Guide for Interpretation, Use of Results from Interlaboratory Testing of Chemical Analysis Methods” and “Guidelines for the Conduct of Chemistry at Nuclear Power Stations,” INPO 13-005, Rev. 0, October 2013.

Specifically, NWT provides chemical species standards in relevant PWR matrices on a quarterly basis to program participants. Blind standards are prepared from the key primary and secondary system parameters shown below. Three 250 ml bottles of each species are sent each quarter. Additional samples are available (see subscription form). Boron and lithium are included each quarter in the primary matrix portion of the primary coolant samples. An extra aliquot of each sample is included in the original shipping containers for return to NWT if concerns arise relative to the effects of shipment. After sample analysis, each utility summarizes its results and analysis techniques on a provided form and returns it to NWT.

Results can be submitted to NWT using the report form. When the results have been received, a quarterly report is issued summarizing and discussing utility results and the techniques employed for each analysis. Q-CHEM participants are identified by a letter in the report and the letter designation for each laboratory is disclosed in the report transmittal letters.

The cost of the basic NWT PWR/Q-Chem program is shown in the subscription form. Additional sample sets may also be acquired.

NWT also has developed custom programs for several utilities. If the standard Q-Chem program does not fulfill all of your needs, we will work with you to establish a more responsive program. Please see the Custom Q-Chem Samples page.

Questions regarding the Q-Chem program should be directed to Mike Miller or Mary Hyde at (408) 281-1100 or

Subscription Form

Print out Subscription Form and fax or mail to Mike Miller at NWT Corporation or download and email.
PWR/Q-Chem Subscription Form

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Report Form

PWR/Q-Chem Set 133 Report Form
Alternatively, you can fax or mail or e-mail your results. `


PWR/Q-Chem Sample Description

Primary Coolant
Species Range
Boron 5 to 1745 ppm
Lithium 0.1 to 5 ppm
Fluoride 1 to 300 ppb
Chloride 1 to 300 ppb
Sulfate 1 to 300 ppb
Silica 10 to 1500 ppb
Sodium 10 to 1500 ppb
Magnesium 10 to 200 ppb
Calcium 10 to 200 ppb
Ammonia 50 to 1500 ppb
Aluminum 10 to 500 ppb
Zinc 1 to 50 ppb
Total Suspended Solids* 0.05 to 50 ppm

Secondary Cycle
Species Range
Fluoride 1 to 200 ppb
Chloride 1 to 200 ppb
Sulfate 5 to 100 ppb
Silica 5 to 500 ppb
Sodium 10 to 100 ppb
Ammonia 50 to 5000 ppb
Copper (Soluble) 2 to 100 ppb
Iron (Soluble) 5 to 100 ppb
TOC* 50 to 500 ppb
Conductivity* 1 to 20 µS/cm
pH* 6.0 to 10