ML19331B903

Ro:On 800803,heat Decay Flow Interrupted.Caused by Traveling Decay Heat Isolation Valve DH11 During Safety Features Actuation Sys Removal.Bistable Reinstalled & Pump Restarted within 3 Minutes

ML19331B903
Person / Time
Site:	Davis Besse
Issue date:	08/04/1980
From:	Murray T TOLEDO EDISON CO.
To:
Shared Package
ML19331B901	List: ML19331B900 ML19331B903
References
NUDOCS 8008130507
Download: ML19331B903 (1)

Text

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c August 4, 1980 TELECCPY h Received Verified Receipt: h no 8 90 _

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TO: U. S. Nuclear Regulatory Commisssion Office of Inspection and Enforcement .

Region III Attention: Tom Tambling s

SUBJECT:

Interruption of Decay Heat Flow.

Davis-Besse Unit 1- Mode 5 Power (MWT)=0, Load (Gross MWE)=0 At 1454 hours0.0168 days <br />0.404 hours <br />0.0024 weeks <br />5.53247e-4 months <br /> on August 3,1980, Instrument and Controls personnel were removing Safety Features Actuation System (SFAS) Channel 4 bistable i BA413 and accidentally caused Decay Heat Isolation Valve DHil to travel closed. The reactor operator immediately stopped DH pump 1-1. This stopped decay heat flow for approximately 3 minutes until the bistable could be re-installed and the pump restarted.

' This occurrence placed the unit in violation of Technical Specification 3.4.1 which requires at least one decay-heat pump- be in operation while the unit is in Mode 5. This incident is being reported in accordance with Technical Specification 6.9.1.8.b.

Luis Reyes, Davis-Besse Unit 1 Resident Inspector, was notified at 220 hours0.00255 days <br />0.0611 hours <br />3.637566e-4 weeks <br />8.371e-5 months <br /> on August 4, 1980.

7 D. W & lA m .

Terry D. Murray Station Superintendent ,

Davis-Besse Nuclear Power Station Toledo Edison Company TDM/mmb r

I e 800813o 5 0 7 . - .

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