ML19320D442
| ML19320D442 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 07/10/1980 |
| From: | Howard J BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 80-143, IEB-80-17, NUDOCS 8007210373 | |
| Download: ML19320D442 (3) | |
Text
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BOSTON EDISON CO MPANY 500 NovLsTON ETAC[T SosfoN. MassAcMustTTs 02199 s cowano wowano July 10, 1980 v.u
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~as.a BECo Ltr. #80-143 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 Teitial Response to IE Bulletin No. 80-17
Dear Mr. Grier:
In a letter dated July 3, 1980, you trenamitted IE Bulletin No. 80-17, titled,
" Failure of 76 of 185 Control Rods to 'tully Insert During a Scram at a BWR".
Boston Edison Company was requested to review the description of circumstances and implement the bulletin actions to insure operability of control rods at Pilgrim Nuclear Power Station. This letter provides our response to Item #1 and includes comments relative to the actions required by Item #2.
1.
Within 3 days from the date of this Bulletin, perform sur"eillance tests to verify that there is no significant amount of water
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the Scram Discharge Volume (SLV) and associated piping and that the SDV vent valves are operable and vent system is free of obstruction.
Response
In order to determine if any significant amount of water was in the scram discharge volume and associated piping, we utilized an ultrasonic examination procedure developed by General Electric which examined the six (6) inch scram discharge header, the two (2) inch reduction line from the discharge header to tha instrument volume tank and the one (1) inch vent line.
The results of these examinations showed an insignificant amount of water in the six (6) inch scram discharge header to be of any cencern, no water or foreign material in the twc-(2) inch line from the scram discharge header to the instrument volume tank, and likcwise, no water or foreign material vac observed in the one (1) inch vent lines.
In order to insure that piping and SDV vent valves are operable and the vent system is free of obstructions, the following surveillance tests were conducted:
The scram discharge volume vent valves (302-21 A&B) and drain valve (302-22) 0, were successfully cycled after the control switch had been placed in the 7
8007210373-
BOLTON EIGN ~ COMPANY Mr. Boyce H. Grier, Director July 10, 1980 Pagc 2 isolation position. Movement of these valves was observed at their location in the system and by remote indication at the control panel.
Upon placing the control switch in manual position, all three valves immediately returned to their open position.
To insure that the drain line from the instrument volume tank to the sump was clear, one control rod drive was scrammed and the increase in the temperature of the drain line was noted as reactor water passed through to the sump. Additionally, the drain line has been " walked" from the SDV to the drain sump and verified to be a " dedicated" drain line.
f 2.
Within ne next 20 days, perform one manual and one automatic scram in that order at normal operating temperature and pressure and with more than 50 percent of the rods fully withdrawn, and obtain the following informat!]n on each scram:...
Comments Boston Edison is actively pursuing this " Scram Malfunction" event with General Electric Company and the utilities involved. We are fully aware of its signif-icance and intend to continue a dedicated effort until complete resolution is accomplished.
We have reviewed the multiple actions requested and are making preparations to comply, however, we respectfully request that you reconsider these requirements based upon the following justification:
a) The results of our testing per Item #1 verified that no blockage exists in the SDV and associated piping and the SDV vent valves are operable and free of obstruction, b) Pilgrim Station has experienced 3 scrams within the past 2 months with no control rods failing to fully insert.
c) The electrical data to be gathered per Items (a), (b), (c), etc., is satisfied on a routi. basis through normal station surveillance pro-cedures. Additionally procedure 8.M.1-20, "High Reactor Level Scram Discharge Tank" performed during our recent refueling outage provides assurance of the proper operating condition of the instrument Volune Level Switches.
d) Obstruction free scram discharge hetders are enhanced through a periodic cleaning of lines via hydrolyzing.
The most recent hydrolyzing was
. performed during our past refueling outage which was cempleted in mid-May 1980.
We trust this letter adequately responds to the Item #1 requirements.
Should i
b 50~, TON E!CEN CZMPANY Mr. Boyce H. Grier, Director July 10, 1980 Page 3 you have any questions or concerns relative to our comments expressed in Iteu #2, please do not hesitate to contact us.
Very truly yours, 2} 2 d )
i cc: Director
)
Division of Operating Reactors i
Office of Nuclear Reactor Regulations U.S. Nuclear Regulatory Commission Washington, D. C.
20555 i
Commonwealth of Massachusetts)
County.of Suffolk
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Then personally appeared before me J. Edward Howard, who being duly sworn, did state that he is Vice President - Nuclear of Boston Edison Company, the applicant herein, and that he is duly authorized to execute and file the submittal contained herein in the name and on behalf of Boston Edison Company and that the statements in said submittal are true to the best of his knowledge and belief.
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