ML20039B704
| ML20039B704 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 12/16/1981 |
| From: | Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| RO-81-56, NUDOCS 8112230447 | |
| Download: ML20039B704 (1) | |
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S ACRAMENTO MUNICIPAL UTfLITY DISTRICT D 6201 S Street. Ow 15830. Sacramento California %Bil, Gl5) 4113211 RJR 81-695 Os.ccmbe r 16, 1927 D
gs R H ENGELKEN, ADMtMISTitATOR x
REGION V 0FFICE Or in5PECTION s. ENFORCEMENT
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U S NUCLEAR REGULATORY COMMISSION 72 1
1450 MARI A LANE SulTE 710
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WALNUT CREEK CA 985a5 4
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DOCKET NO. 50-312 d
LICEMSE NO DPR-54 REPORTABLE OCCURREtlCE Bi-56 In accordance wi th Pancho Seco Nuclear Generat ing St ation Technical Speci ficat ions Sec tion 6.9.4.1(f) and Regulatory Guide
- 1. t f. Sec t i on C.2.a(6), the Sacramento Munic i pa l Ut ility Oi t.t r i ct hereby submits the. following report of Reportable Occurrence 81-56.
Vhile performing instrument Survel11ance I-1088 with Reactor Protection System Channci C declared administratively inoperable and in Manual hypass, the inst ruraent Technician did not properly insure that the trip' system was properly set up to retain a minimum degree of redun-dancy as required by Technical SpecI fIcat ion sece ions 3.5.1 I and 3.5.1.2.
Procedure I-108B autfior' zed the testing of Channel B provided Channel C was tripped rather than bypassed.
With Channel C tripped the mi.nimum level of redutsdancy would have been retained during testing.
In fact, the technici an erroneous ly ~ used the sirnulat e trip switches
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on the Reactor Trip Module in attempting to trip Channel C.
While this did open the breakers controlled by RPS Channel C as if it had tripped, it did not open the' relay contacts in t he two-ou t -o f-fou r relay. logic in the other RPS channels in order to change a two-out-of-three condition (established by placing RPS Channel B in Manual Bypass per 1-1088) to a one-out -of-two condi t ion, preserving the gainimum level of redundancy.
Thus as far as RPS Channel A and D were concerned, RPS Channel C was not t ripped.
This situation was discussed with the NRC Resident inspector on December f5. 1981.
A complete report wi t.) be forwar ded to your of fice within 14 days.
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R. J. Rod riguer
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ir rtanager Nuclear Operat ions
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