ML20054E193
| 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: |
| References | |
| NUDOCS 8204260240 | |
| Download: ML20054E193 (1) | |
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)MXEDO L___ 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.
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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 f
Terry D. Murray Verified R..pt: yes no
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Station Superintendent Date l
Davis-Besse Nuclear Power Station 93,3
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Initials 55/$b-TDM/MER/1jk cc: Luis Reyes j
820426 0 ND THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43652 l
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