ML18093A218
| ML18093A218 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 07/09/1987 |
| From: | Corbin McNeil Public Service Enterprise Group |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NLR-N87123, NUDOCS 8707150060 | |
| Download: ML18093A218 (2) | |
Text
Public Service Electric and Gas Company Corbin A. McNeill, Jr.
Senior Vice President -
Nuclear Public Service Electric and Gas Company P.O. Box236, Hancocks Bridge, NJ 08038 609 339-4800 July 9, 1987 NLR-N87123 United States Nuclear Regulatory Commission Document Control Desk Washington, DC 205?5 Gentlemen:
RWST CONCENTRATION LICENSE CHANGE REQUEST SALEM UNIT NOS. 1 AND 2 DOCKET NOS. 50-272 AND 50-311 The purpose of this letter is to document a recent conversation with Margaret Chatterton of your staff regarding License Change Request (LCR) 87 Refueling Water Storage Tank (RWST) Boron Concentration Increase.
One section of the LCR addressed spray and sump pH values and stated that the new calculated values were bounded by current FSAR values.
Conversations with Ms.
Chatterton indicate that this statement should be clarified.
The Salem FSAR currently states that the Containment Spray System would provide spray at a pH of 10.0.
The LCR analysis determined the spray pH to be 9~2.
Although the revised pH is lower than the FSAR value, there is no decrease in the iodine removal effectiveness of the sprays.
This determination is based on the recommendations of NUREG-0800, Section 6.5.2.
Specifically, the spray partition coefficient is maximized at pH 8.5.
- Hence, sprays with pH in the range of 8.5 to 11.0 have equal iodine removal effectiveness.
The new pH of 9.2 is therefore in agreement with the analysis used to determine iodine partition factors as used in the Salem FSAR dose assessment models.
The Salem FSAR currently states that the minimum sump solution pH will be 8.5.
The LCR analysis determined that the minimum pH, with the Boron Injection Tank (BIT) is 8.4.
(Note:
Without the BIT, the minimum pH is approximately 8.5.
BIT removal was approved by the NRC on April 7, 1987).
While the pH calculated in the LCR is slightly lower than that specified in the FSAR, there is no impact on radiological consequences, equipment qualification or long term hydrogen generation.
First, a solution pH of approximately 7.5 will support the elemental iodine decontamination factor of 100 assumed in the FSAR dose analysis.
Secondly, the requirement of Branch Technical Position MTEB 6-1 (pH in the range of 7 to 9.5), for protecting against chloride induced stress corrosion cracking of stainless steel, is
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7-9-87 satisfied.
Finally, hydrogen generation due to corrosion of aluminum and zinc, at the revised pH, will be equal to or less than assumed in the FSAR analysis, based on the corrosion data presented in WCAP-8776, provided the pH remains in the caustic range.
Should you have any questions, please do not hesitate to contact us.
Sincerely, C
Mr. D. c. Fischer USNRC Licensing Project Manager Mr. T. J. Kenny USNRC Senior Resident Inspector Mr. w. T. Russell, Administrator USNRC Region I Mr. D. M. Scott, Chief Bureau of Nuclear Engineering Department of Environmental Protection 380 Scotch Road Trenton, NJ 08628