GO2-82-147, Submits Proposed Outline of Facility Fuel Rack Surveillance Program Per 820122 Telcon
| ML17276B052 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 02/05/1982 |
| From: | Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| GO2-82-147, NUDOCS 8202120073 | |
| Download: ML17276B052 (6) | |
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AGCESSION NBR:8202120073 DOC ~ DATE: 82/02/05 NOTARIZED:
NO FACIL:50 397 WPPSS Nuclear Projects Unit 2~ Washington IPublic Powe AUTH BYNAME AUTHOR AFFILIATION BOUCHEYsG.D.
Washington.Public 'Power Supply System RECIP ~ NAhiE RECIPIENT AFFILIATION
'SCHWENCEREA ~
Licensing Branch "2 SUBJECT>
Submots proposed outline of dacility fuel rack surveillance program per 820122 telcon.
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- ,', PDR ADOCK 05000397 Washington Public Power Supply System P.O. Box 968 3000George Washington Way Richland, Washington 99352 t509) 372-5000 February 5, 1982 G02-82-147 SS-L-02-KSN-82-007 Docket No. 50-397 Mr. A. Schwencer, Chief Licensing Branch No.
2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Schwencer:
FEB L Qggfc il n,
Subject:
NUCLEAR PROJECT NO.
2 FUEL RACK SURVEILLANCE PROGRAM Below you will find the proposed outline of the WNP-2 Fuel Rack Surveil-lance Program which was discussed in a telephone conversation between your Mr. Benard Turovline and our Messrs.
Roger Nelson and Mike Berry on January 22, 1982:
PROPOSED OUTLINE OF WNP-2
'FUEL RACK SURVEILLANCE PROGRAM Spent Fuel Rack Boron Carbide (B4C) Plate In-Service Surveillance Program:
I.
Potential off-gassing of the neutron, absorbing boron carbide plates in the spent fuel racks with possible resultant deformation of the fuel box can could require a change in the design from a dry plate installation to a wet plate installation.
II.
This design change to the WNP-2 spent fuel racks will be made by cutting-off the "leak-test" port plug that is located near the top of each rack assembly.
Since all the fuel boxes within each rack assembly are inter-connected, only one venting location is required per module.
This vent would allow the gasses to escape to the pool.
Eventually, water would fill the small void area around the B4C plate, thus wetting the neutron absorber material.
III. To moni tor the fuel racks for potential off-gassing problems as well as to insure that the B
C plates would continue to be effective after exposure to 3 wet environment, an In-Service Surveillance Program will be established to monitor both for off-gassing and B4C degradation.
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Mr. A. Schwencer Page Two February 5,
1982 G02-82-147 IV.
The Surveillance Program will consist of the following steps:
A.
Monitoring of Sealed B
C Samples exposed to discharged spent fuel for signs of swelling.
Measuring of gas pressure via the connection port may be utilized.
Sealed samples to be fabricated out of 304 S/S material similar to actual fuel boxes.
If samples exhibit swelling check fuel boxes for deformation by use of gaging fixture.
B.
Monitoring of vented (to pool water)
B C samples for signs of physical and/or chemical degradation.
A visual examina-tion of the B
C sample coupons will be made to evaluate surface appearance,size, shape and color.
Mechanical test-ing of B C samples will be done on a periodic basis to determin3 if physical degradation is occurring in the plate material.
In addition, chemical testing will take place on a periodic basis to determine if leaching of the boron con-tent is occurring.
This test data will be compared to pre-dicted valves that have been obtained from previous studies by the B
C plate fabricator.
Also, studies by other utili-ties usi3g similar B
C material for high density spent fuel racks will be monito$ ed for information.
C.
If swelling is detected at some future time in the fuel cans then a program to vent the racks will be utilized. 'he venting operation will consist of mechanically "cutting-off" the leak-test port plug which was seal welded in place at the manufacturer's shop.
The monitoring of the vented B
C samples will continue to occur until sufficient data ind)cates that a 40 year life for the plate material can be obtained.
Very truly yours, G.
D. Bouchey Deputy Director, Safety and Security KSN/jca cc:
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NRC WS Chin
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