ML20137L371

From kanterella
Jump to navigation Jump to search
Amends 840830 Response to Insp Rept 50-312/84-08 Re Reactor Bldg Isolation Valves.Combination of Procedural Controls & Design Considerations Expected to Resolve Commission Concern
ML20137L371
Person / Time
Site: Rancho Seco
Issue date: 11/25/1985
From: Latham W
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To: Martin J
NRC OFFICE OF ADMINISTRATION (ADM), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
RJR-85-484, NUDOCS 8512030427
Download: ML20137L371 (2)


Text

e - . . _ .

'4 0

esuu. SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street, P.ot Box 15830, sacramento CA 95852-1830,{916) 452-3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA RJR 85-484 November 25, 1985 J B MARTIN REGIONAL ADMINISTRATOR REGION V 0FFICE OF INSPECTION AND ENFORCEMENT ATTN DOCUMENT CONTROL DESK U S NUCLEAR REGULATORY COMMISSION WASHINGTON DC 20555 D0LKET NO. 50-312 LICENSE NO. DPR-54 NRC INSPECTION REPORT N0. 50-312/84-08, SUPPLEMENTAL RESPONSE The Sacramento Municipal Utility District has established an Incident Analysis Group whose function is to review selected incidents and determine root causes and coordinate the development of corrective actions. During a review of documents associated with this incident, some errors were identified in the District's response to NRC Inspection 84-08, dated August 30, 1984.

Under Item III, Operation Problems, the NRC expressed the following concern:

Concern (a) - Reactor building isolation valves supplying containment atmosphere samples to PASS, the H2 monitors and radiation monitor R-15044 cannot be opened during plant operation due to a technical speci-fication limitation (unresolved). A proposal to change the current sample penetration to the penetration supplying the existing containment monitor is under consideration.

The District's response to that item is hereby amended to state as follows:

Response: There are four reactor building isolation valves on the sample outlet and four on the sample inlet. These valves are arranged in a series-parallel design with two of each set of four valves powered by an independent power source. These valves are described as remote manual valves, operated from a control panel on the grada level of the auxiliary building.

Ths w <a'.ves are normally locked closed under the provisions of Rand.o Seco's locked valve list using a lockwire and lead seal attached to a coverplate. The coverplate prevents inadvertent operation of the valves and provides, via the locked valve pro-cedure, a means to adequately control and monitor the valves' status. Should sa11pling be required at any time that containmenc integrity is required per technical specifications, an individual will be in attendance while the valves are open.

\

os120:304U 051125 12 PDR O

ADOCK 0500 8}

. - _ = - _ - .

4:

a -

This combination of procedural controls and design considerations should resolve the Commission's concern with respect to this item.

The cover plate identified in the.above_ response is a recent modification to the_ PASS to enable the use of existing procedural controls at Rancho Seco.

The appropriate procedures'will be identified and revised to include the re-quirement to have an individual.in attendance at ti.e valve controls while the valves are open under the circumstances described above. These revisions should be complete prior to using these-valves, but not later than January 16, 1986.

If there'are any questions with respect to this amended response to Item IIIa, please^ contact R. W.' Colombo at the Rancho Seco Nuclear Generating Station Unit No. 1.

h WILLIAM K. LATHAM 5- uf ACTING GENERAL MANAGER

,