ML20077S305
| ML20077S305 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Crane |
| Issue date: | 07/22/1977 |
| From: | Paperiello C NRC |
| To: | NRC |
| Shared Package | |
| ML20077S281 | List: |
| References | |
| FOIA-83-349 NUDOCS 8309220014 | |
| Download: ML20077S305 (4) | |
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JUL 2 21977 fi40 MEMORANDUM FOR:
File t
THRU:
J. P. Stohr, Chief Environmental and Special Projects Section i
FROM:
C. J. Paperiello, Radiation Specialist
SUBJECT:
CHLORIDE RESULTS FOR THE FURMINITE MATERIAL FROM THREE MILE ISLAND At the end of March, E&SP Section was requested by operations to determine the total chloride and leachable chloride in a sample of material called Furminite.
The material was being used as valve sealant at Three Mile Island, Unit 1, and there was a question with respect to the possibility that chloride ions could leach from the material, build up a high local concentration of chloride and cause stress corrosion in the area of the valve.
Measurements made by the licensee and licensee contractors are presented in Table 1.
With' the variations in the above data, a confirmatory measurement by the f
NRC was desirable. A sample of approximately 4 grams mass was sent to the Idaho Health Services Laboratory (IHSL) for analysis.
In addition, a' copy of the analytical procedure used by the licensee, GPU, was also sent.
IHSL performed the short tern'1 (15 min.) leach test as described in the licensee's procedure.
However, the analysis for chloride in the water used for leaching was performed using an ion selective chloride electrode as compared to the licensee's use of the mercuric thiocyanate (ASTM D-512) method.
For total chloride IHSL used a sulfuric and nitric acid decom-position in a closed system as compared to the licensee's dry ash and fusion technique. This was done in order to prevent the possible loss of volatile chlorides.
The ion selective electrode was used for the chloride ion analysis of the decomposition produce.
Results are presented in Table 1.
In addition, samples were also run using the quality control technique called the method of known addition.
In this method a known amount of the material for which one is analyzing is added to the unknown.
One subtracts 4
this amount from the analytical result.
If one gets the[ final result with and without the spike, this confinns that the analytical technique is quantitative.
IHSL confirmed their previous results for total chloride l
using this method.
i 8309220014 830728 PDR FOIA PETCHE83-349 PDR
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IHSL's results were nearly two orders of magnitude greater than the licensee's.
Several discussions were held between the NRC and the licensee and among IHSL, NRC and the licensee.
As a result about 20 grams of a new sample were sent on April 15 to IHSL.
IHSL agreed to use the licensee's procedures in addition to its own on this analysis.
In addition, a sample was sent by IHSL to Allied Chemical at Idaho Falls. Allied Chemical used a procedure which employed a total decomposition in an oxygen bomb and dual column ion chromatography.
These results are presented in Table 1.
In addition, IHSL on their own sent a sample to another group at the. site who perfonned neutron activation on the sample, this result is also pre-sented in Table 1.
Results on the second sample sent to IHSL are consistent with the licensee and licensee contractor results.
Total chloride appears to be in the order of 50 ppm.
Leachable chloride appears to be less than 10 ppm.
How-ever, IHSL's results using the specific ion electrode on the second sample are consistent with the results using other analytical techniques.
IHSL's results for the first sample must be considered therefore as' correct and it should be concluded that the first sample was high in chloride.
The most probable explanation of the high chloride in the first sample is external contamination between the time of sampling and IHSL's measurements.
4 Carl J. Paperiello Radiation Specialist A.'
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