PLA-1697, Responds to IE Bulletin 83-03, Check Valve Failures in Raw Water Cooling Sys of Diesel Generators. Listed Check Valves in Essential Svc Water Flowpath Will Be Included in Rev 2 to 830630 Pump & Valve Inservice Test Program
| ML20076F911 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 06/09/1983 |
| From: | Kenyon B PENNSYLVANIA POWER & LIGHT CO. |
| To: | Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-SSINS-6820 IEB-83-03, IEB-83-3, PLA-1697, NUDOCS 8306140482 | |
| Download: ML20076F911 (3) | |
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1 1
i PP&L Pennsylvania Power & Light Company Two North Ninth Street
- Allentown, PA 18101
- 215 / 770-5151 Bruce D. Kenyon Vice President-Nuclear Operations 215/770-7502 JUN 0 91983 Mr. James M. Allan Acting Regional Administrator-Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 SUSQUEHANNA STEAM ELECTRIC STATION RESPONSE TO IE BULLETIN 83-03 ER 100450 FILE 842-03 Docket Nos. 50-387 PLA-1697 and 50-388
Dear Mr. Allan:
The following response is provided to IE Bulletin 83-03, "Chc.::k Valve Failures in Raw Water Cooling Systems of Diesel Generators."
Unit 1 (OL) 1.
The check valves in the ESW system flowpath for supplying cooling water to the diesels and which are required to change state to accomplish this task gre:
0-11-001 0-11-033 0-11-037 0-11-002 0-11-034 0-11-038 0-11-003 0-11-035 0-11-039 0-11-004 0-11-036 0-11-040 These valves will be included in Rev. 2 to the SSES Pump and Valve IST Program currently scheduled for submittal on June 30, 1983.
2.
For the valves listed above, verification of check valve operability and internal integrity will be accomplished by valve disassembly and inspection.
3.
The initial inspection of the 12 valves listed above will be performed during the first refueling outage on Unit 1 (currently scheduled to begin September 1, 1984).
Six of the valves listed will be examined during each subsequent refueling outage for Unit 1 on an alternating basis.
4.
There have been no previous failures of the valves listed.
- However, there has been a failure of another check valve within the ESW system that may have inhibited the operation of the diesel generators upon an ESW actuation:
i.#l 8306140482 830609 PDR ADOCK 05000387 G
/
Page 2 SSES PLA-1697 JUtl 0 9 198,d ER 100450 File 842-03 Mr. James M. Allan During the implementation of a plant modification to permanently remove the internals on check valve 0-11-053, it was discovered that the valve disc was not attached to the swing arm and the cotter pin and nut were missing. Consequently, the valve was inoperable.
This valve is located on the ESW return header to the spray pond.
The valve was originally installed to prevent reverse flow in the ESW system when RHRSW is on and ESW is off. However, the configur-ation of the ESW system prevents reverse flow via the ESW pump discharge check valves (0-11-001, 0-11-002, 0-11-003, 0-11-004)..In addition, two other redundant means are available to prevent reverse flow:
a) The ESW pump discharge valves are closed when ESW is not running. (motor operated butterfly valves) b) An interim operating procedure prerequisite assuring that ESW is running before RHRSW is started.
Due to the redundancies within the system and the inherent and gener,ic deficiencies related to these check valves, the plant modification to remove the internals of check valve 0-11-053 was instituted which eventually led to the discovery of the check valve's failure. This failure was documented in License Event Report 83-066 transmitted under PLA-1667 H. W. Keiser to J. M. Allan dated 5/13/83.
5.
A ceport will be submitted 90 days af ter the initial valve disassembly and inspection.
Unit 2 (CP)
The valves listed are common to both Unit 1 and Unit 2.
The preparation of the Unit 2 Pump and Valve IST program will follow the same basis as the Unit 1 IST p.ogram for common equipment.
Very truly yours, r
B. D. Kenyo Vice President-Nuclear Operations Affidavit cc:
U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C.~
20555 Mr. G. G. Rhoads - NRC Senior Resident Inspector
O 9
AFFIDAVIT COMMONWEALTH OF PENNSYLVANIA)
- ss COUNTY OF LEHIGH
)
I, BRUCE D. KENYON, being duly sworn according to law, state that I am Vice President, Nuclear Operations of Pennsylvania Power & Light Company and that the facts set forth on the attached response by Applicants to IE Bulletin 83-03 are true and correct to the best of my knowledge, information and belief.
QI wM onn Bruce D. Kenyon Vice President, Nuclear Operations Sworntoandsugibed before me this day of June, 1983
$ Y 0.
2 MARTIN.TM[d,'idffry Public Mentown, Lehigh County, Pa.
14 Commission Expires Jan.13.1984