ML20003A479
| ML20003A479 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 12/05/1980 |
| From: | Morisi A BOSTON EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 80-301, NUDOCS 8102040116 | |
| Download: ML20003A479 (2) | |
Text
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Th BOSTON EpisON COMPANY GENERAL Orrtcrs 500 sovLaTow Srnett Bo EfoN. M ASE ACMUS ETTE O219 9 tr F
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MANAGER' NUCLEkR QPERATIONS SUPP T DEPARTMENT December 5, 1980 L:
BECo. Ltr. #80-301
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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 Confimatory Order Concerning Scram Discharge Volume Modifications
Dear Sir:
Please be advised that in accordance with your Confimatory Order dated October 2,1980 we have installed and made operational a continuous water level monitoring system for the Scram Discharge Volume, which includes an indication and alam in the control room.
Initial calibration procedures were implemented.
Operational procedures are being developed and essential personnel shall be indoctrinated accordingly.
Also, per the recent discussions with members of your staff involved in the review of this subject, we offer the following clarification regard-ing our use of the station computer to monitor the instrument operability described in item #2 of Supplement #3 to IEB #80-17. Specifically, com-pliance with item 2 above required functional tests using water for the instrument volume level alarm, rod block and scram switches after each scram event, before returning to power.
Due to excessive radiation levels in the area of these instruments and our comittment to the ALARA program, switch operability was determined in accordance with G.E. SIL 331, Supple-ment 3, which utilizes the station computer.
However, we are currently in the process of modifying our computer inputs to include recordings for all six level switches including the "not drained alarm". Upon implementa-tion of these modifications, station procedures will be revised to reflect the following acceptance criteria for detemining instrument operability:
A.
Verify that all four level switch scram signals, the Hi level rod block signal, and SDIV not drained alarm have tripped and are still in by reviewing the alarm typer.
B.
Bypass the scram discharge volume High level scram and verify the following by reviewing the alarm typer:
(1) RPS level switch B2 resets first 8102 0 4 pll(,
-.' IQ$ ION EDicQN COMPANY i
(2) All RPS and Rod Block level switches clear within 30 seconds of B2 clearing.
(3) The scram discharge volume not drained alarm clears within 9 minutes.
(4)
If conditions (1) through (3) are not satis-fled, verify that SDIV vent and drain valves are open by local observation of valves /
feeling drain line.
If system operation.
appears normal, notify the Chief Technical Engineer and request the performance of sur-veillance 8.M.1-20 NOTE All level : witches must be operable prior to startup.
These modifications and procedure revisions are expected to be in place by December 19, 1980. Until then Surveillance Procedure 8.M.1-20, High Water Level Scram Discharge Tank, will continue to be performed prior to startup if a scram should occur. The excessive radiation levels in the instrument area will be investigated and corrected during our next refueling outage.
We trust these actions adequately address your concerns. Should you have any questions, please do not hesitate to contact us.
Very truly yours, (jf).' 'M'M cc:
Director Division of Reactor Operations Inspection
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U.S. Nuclear Regillatory Commission '
Washington, D. C.
20555
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