05000293/LER-1986-001, :on 860106,unplanned Reactor Scram Occurred During Plant Startup Due to Low Reactor Water Level Being Controlled Manually.Caused by Operator Error.Personnel Counseled & Evaluation Initiated

:on 860106,unplanned Reactor Scram Occurred During Plant Startup Due to Low Reactor Water Level Being Controlled Manually.Caused by Operator Error.Personnel Counseled & Evaluation Initiated

ML20137R333
Person / Time
Site:	Pilgrim
Issue date:	02/04/1986
From:	Hamilton P, Harrington W BOSTON EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
86-010, 86-10, LER-86-001, LER-86-1, NUDOCS 8602130059
Download: ML20137R333 (3)

LER-1986-001, on 860106,unplanned Reactor Scram Occurred During Plant Startup Due to Low Reactor Water Level Being Controlled Manually.Caused by Operator Error.Personnel Counseled & Evaluation Initiated

Event date:
Report date:
2931986001R00 - NRC Website

text

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On 1/6/DF, an unplanned reactor scram occurred during plant startup. The scram ww the result of a low reactor water level which was being controlled

, manually when the event occurred.

Cause of the event was due to licensed operator error.

The error occurred

< when the operator did not take the prompt action required to restore level.

Corrective action was to counsel personnel and submit a request to engineering to evaluate the feasibility of modifying the level control. system.

A previous event is discussed in LER 85-014.

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.p e r asiaw nn On 1/6/86 at 1959 hours0.0227 days <br />0.544 hours <br />0.00324 weeks <br />7.453995e-4 months <br /> an unplanned reactor scram occurred from approximately 10% power during plant startup. The scram was the result of a low reactor water level which was being controlled manually at the time of the event.

When the scram occurred,.the turbine was off line, reactor pressure was approximately 930 psig and the modo switch was in the "run" position.

Cause of this event was utility licensed operator error. - The error occurred

.just prior to placing the feedwater regulating valves in service. -At the time of the event, power level was approximately 10% steady state, water level being controlled with the startup regulating valve, and the water level was L

decreasing. The scram occurred when the operator did not open the downstream block valves and place a feedwater regulating valve in service in the prompt nanner necessary to restore level. During the event water level was fluctuating as it normally does when at reduced steaming rates.

Corrective action was to counsel Operations personnel with regard to the event.

Planned long term corrective action is to consider modifying the startup feedwater regulating system for automatic operation (Ref. ESR 86-013).

In addition, a new plant specific simulator is currently under cc otruction and when completed is expected to contribute to reducing the possibility of a similar occurrence.

l There were no equipment failures associated with this event and the scram sequence was normal. On 1/7/86, at 1027 hours0.0119 days <br />0.285 hours <br />0.0017 weeks <br />3.907735e-4 months <br /> the generator was synchronized to the grid.

j A previous scram that occurred while manually controlling water level is l

discussed in LER 85-014.

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EOSTON EDISON COMPANY 500 CovLsTON STREET 50sTON, MAssAcMuBKTT5 02199 WILLIAM D. HARR8NGTO N cc.6 4.

February 4, 1986 BECo Ltr. #86- 010 Document Control Desk U. S. Nuclear Regulatory Commission

- Washington, D.C.

20555 Docket Number-License No. DPR-35

Dear Sir:

The attached-Licensee Event Report 86-001-00, " Unplanned Reactor Scram on Low Water Level Due to Operator Error", is hereby submitted in accordance with the requirements of IOCFR50.73.

If there are any questions on this subject, please do not hesitate to contact me.

Respectfully submitted, W. D. Harrington PJH/keo

- Enclosure:

LER 86-001 cc:

Dr. Thomas E. Murley Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Standard DECO LER Distribution