ML19331C572
| ML19331C572 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 07/30/1980 |
| From: | Andognini G BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 80-160, IEB-80-14, NUDOCS 8008190058 | |
| Download: ML19331C572 (3) | |
Text
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". R EOSTON EDISON COMPANY GENasAL Grrects 500 SovtsTON Stast?
BostcN. MassacNuncTTs 02199 G. CARL ANDOGNINO suPSWIN?tNDENT
$tu1 LEAN OptAATIONs Ospas?NENT July 30, 1980 BECo. Ltr. #80-160 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA.
19406 License No. DPR-35 Docket No. 50-293 Response to I&E Bulletin 80-14 Ref. a) NRC letter to all BRW s, "Model Tech. Specs for SDV Vent and Drain Valves" dated July 7, 1980.
Dear Sir:
IE Bulletin 80-14 described circumstances which resulted in degradation of the SDV function.
Boston Edison Company was requested to take the following actions in a review of this problem at Pilgrim Nuclear Power Station:
Item 1.
Review plant records for instances of degradation of any SDV level switch which was or may have been caused by a damaged or bent float assembly.
Identify the cause and corrective action for each instance.
Item 2.
Review plant records for instances of degradation of SDV vent and drain valve operability. Provide the closure times required and typically observed for these valves and the basis for the required closing times.
Identify the cause end corrective action for each instance of degradation.
Response 1 & 2 A review of plant records showed no instances of SDV level switch degradation and no instances of degradat.cn of SDV vent and drain valve operability.
i No closure times have been provided as there are currently no requirements in our Technical Specifications or Station Operating Procedures for the testing or timing of the SDV vent and drain valve.
8 008190058
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1 CDOTON EDICON COMPANY Mr. Boyce H. Grier July 30, 1980 Page 2 Item 3.
By procedures, require that the SDV vent and drain valves be normally operable, open and periodically tested.
If these valves are not operable or are closed for more than I hour in any 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period during operation, the reason shall be logged and the NRC notified with 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (Prompt Notification).
Response
Current procedures already require that the SDV vent and drain valves be nor= ally operable and open.
Periodic testing can be accomplished through the use of the test solenoid installed in the SDV instrument air line but could not be used as a true indication of valve operability with respect to actual closure times experienced during a scram. The SDV instrument air header also connects to the header feeding the scram valves and actuation of the test solenoid to bleed the SDV vent and drain lines could possibly affect scram valve operability during the testing period.
These cencerns are currently being evaluated and will be addressed in conjunction with our response to the reference a) model technical specifications.
Item 4.
Review instances in which water hammer or damage which may have been caused by water hammer has occurred in SDV related piping.
Identify the cause and corrective action i
for each instance.
Response
A review of plant records showed no instances of water ha==er damage in SDV related piping.
l Item 5.
Review surveillance procedures to ensure that degradation of any SDV level switch due to a damaged float or other cause would be detected and that inoperability from any cause would be reported to the NRC.
Response
A procedure revision to incorporate the above requirements has been initiated and will be in effect prior to the next scheduled performance of the test.
Item 6.
If no functional test /or inspection which would detect degradation of each SDV level switch has been performed during the past 3 months, make provisions to perform an inspection and functional test of all SDV level switch assemblies at the next reactor shutdown of greater than 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> duration.
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I'OZTON EDCON COMPANY Mr. Boyce H. Grier July 30, 1980 Page 3
Response
A functional test performed on 5/2/80 and an inspection performed on 3/7/80 indicated no degradation of SDV level switch assemblies.
We trust this letter adequately responds to the concerns of the subject bulletin.
However, should you have any further questions please do not hesitate to contact us.
Very truly yours,
'ff sy Attachments cc:
Director United States Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, D. C.
20555