ML20054E193

Telecopy RO Re Max String Error of Pressure/Temp Bistable of Reactor Protection Sys Exceeding Allowable Values of Tech Spec 2.2.1,Table 2.2-1.Event Reported on 811016.Facility Change Request Implemented

ML20054E193
Person / Time
Site:	Davis Besse
Issue date:	10/16/1981
From:	Murray T TOLEDO EDISON CO.
To:	Mcgregor L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20054E178	List: ML20054E193 ML20054E197 ML20054E200
References
NUDOCS 8204260240
Download: ML20054E193 (1)

Text

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.. a EDISON TELECOPY October 16, 1981 TO: U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region III Attention: Mr. Leonard McGregor Davis-Besse Unit 1 Mode 1 Power (MWT) = 2772 and Load (Gross MRE) = 926 Reportabic Condition Per Technical Specification 6.9.1.8.b 1

After a request by the NRC Resident Inspector, an engineering evaluation of Sur-veillance Test ST 5030.06 revealed that the maximum string error of the pressure /

temperature bistable of the Reactor Protection System exceeded the allowable values of Technical Specification 2.2.1, Table 2.2-1. The FSAR assumed a maximum string error of 1 F and the engineering analysis revealed a maximum of 1.490F. An analy-sis by the NSSS supplic howed that the worst case DNBR was 1.416 using the maxi-mum string error oE/ 1.49 This is more conservative than the Technical Specifi-cation value of 1.3'O.

The event was determined reportable on October 16, 1981. As a precautionary measure, Facility Change Request 81-266 was implemented on October 14, 1981 resetting the pressure / temperature bistables to ensure that they were within the allowable limits.

There was no danger to the health and safety of the public or station personnel.

l l This event is being reported under Technical Specification 6.9.1.8.b.

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Luis Reyes, NRC Resident Inspector, was contacted at 1505 hours0.0174 days <br />0.418 hours <br />0.00249 weeks <br />5.726525e-4 months <br /> on October 16, 1981.

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[M TELECOPY~ Sen /P.ec ved Verified R . .pt: yes no f Terry D. Murray l Station Superintendent Date /O-/0'E l Davis-Besse Nuclear Power Station 93 ,3 / g,cf> hours l

Initials 55/$b-TDM/MER/1jk j cc: Luis Reyes 820426 0 ND

! THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43652 l

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