ML20028H380
| ML20028H380 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 12/21/1990 |
| From: | Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-GTECI-070, REF-GTECI-094, REF-GTECI-NI, TASK-070, TASK-094, TASK-70, TASK-94, TASK-OR GL-90-06, GL-90-6, NYN-90217, NUDOCS 9101020192 | |
| Download: ML20028H380 (3) | |
Text
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khh Ted C. Feigenbovm Preudent and Chief Enecutiva Officer NYN. 90217 December 21, 1990 United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Document Control Desk
References:
(a)
Facility Operating License No. NPF-86, Docket No. 50 443 (b)
USNRC Generic Letter 90 06, dated June 25, 1990, ' Resolution of Generic lasue 70, ' Power-operated Relief Valve and Block Valve Reliability', and Generic issue 94,
' Additional Low-Temperature Overpressure Protection For Light Water Reactors', Pursuant to 10 CFR 50.54(f)*
Subject:
Response to Generic Letter 90 06 Gentlemen:
New llampshire Yankee provides the following information in respense to Generic Letter 90-06 regarding the pressurizer power operated telief valves (PORVs) and block valves installed in Seabrook Station. This information addresses design, programmatic and technical specification requirements applicable to the PORVs and block valves.
The Scabrook Station PORVs are solenoid valve-controlled, pressure actuated, poppet-type relief val /es which do not depend upon control air systems for their operation. The block valves are flexible wedge, ris'ng stem, motor operated gate valves.
The Seabrook Station PORVr., block volves and associated components were designed to meet safety-grade requirements. Mechanically, the PORVs and block valves are Safety Class I components. Electrically, the PORY solenoids and the block valve rootor operators are designated Class 1E. The PORY and block valve control switches, selector switches and position indication are also designated Class IE. Other electrical components in the PORV and block valve circuitry including cables, connectors and splices that are located in harsh environments are environmentally qualified.
The PORV circuitry includes contacts from re. lays driven by non safety related signals associated with automatic control functions. These relays are not qualified but are similar to Class IE relays. An analysis has been performed to demonstrate that no credible failure of these relays can create a condition which degrades the function of the Class 1E portion of the PORY circuitry.
9101020192 901221 PDR ADOCK 05000443 P
PDR g
New Hampshire Yonkee Division of Public Service Company of New Hompshire i O g } - {; 4 fj P.O. Box 300
- Soobrook, NH 03874 + Telephone (603) 474 9521
United States Nuclear Regulatory Commission December 21, 1990 Attention:
Document Control Desk Page two The PORVs and block valves at Seabrook Station are included within the scope of the NHY Operational Quality Assuranic Program and are therefore listed in FSAR Table 3.7-2.
The following programmatic requirements applicable to the PORVs and block valves have been implemented. Approved procedures implement maintenance requirements for the PORVs and block valves in accordance with manuf acturer's recommendations. Maintenance is performed by trained maintenance personnel. The PORVs and block valves are included within the scope of the Inscivice Testing Program for valves. The block valves are included within the scope of the Motor Operated Vdve Testing Program being developed in response to NRC Generic Lctter 8910.
Complet : replacement PORVs er black valves would be purchased, if needed, in accordance wi.h the requirements of the original construction specification including applicable amend sents. Replacement parts for the PORVs or block valves would be purchased, if needed, by reference to the original manufacturer or supplier's part number. Additionally, purchasing requirements have bcLu pre-established for specific valve parts based upon a review of thi safety function of each part with input from the original manufacturer and/or supplien T tese requirements are imposed by the parts purchase order.
New Hampshire Yankee intends to propose plant specific technical specification changes regarding PORV operability. The proposed changes will be based upon the model technical specifications provided as Attachment A 1 of Enclosure A to Generic Letter 90-06.
Additionally. NHY Antends to propose plant specific technical specification changes relating to low temperature overpressure protection. These proposed changes will be based upon the model technical specifications provided as Attachment B-1 to Enclosure B of Generic Letter 90 06, but will reflect the fact that either the residual heat removal system (RHRS) suction relief valves or the PORVs can provide the required low temperature overpressure protection. The proposed technical specification changes described above will be submitted prior to startup following the first refueling outage.
New Hampsnire Yankee is working with six other utilities in developing a common approach to the proposed technical specification changes associated with Generic Letter 90-
- 06. The plants involved in this effort are: Wolf Creek, Vogtle, Comanche Peak, Millstone 3, Seabrook, Byron, Braidwood, and Callaway. A joint effort is facilitated by the similarity of plant types and technical specifit-adins. All the plants in (L: group are Westiaghouse PWRt which utilize the PORVs ano RHRS suction relie.f valves for low temperature overpressure protection.
If you have any questions on this matter, please contact Mr. Geoffrey Kingston at (603) 474-9521, Extension 3371.
Very truly yours,
,f/V fh Ted C. Feigenbaum TCF:GK/ssi
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i United States Nuclear Regulatory Commission December 21, 1990 Attention:
Document Control Desk Page three cc:
Mr, Thomas T. Martin Regional Administrator United States Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406 Mr. Noel Dudley NRC Senior Resident Inspector P.O. Box 1149 Seabrook, NH 03874 STATE OF NEW HAMPSHIRE Rockingham, ss.
December 21, 1990 Then personally apper ed before me, the above naraed Ted C. Feigenbaum, being duly sworn, did state that he is-President & Chief Executive Officer of the New Hampshire Yankee Division of Public Service Company of New Hampshire, that he is duly authorized to execute and file the foregoing information in the name and on behalf of the New Hampshire Yankee Division of Public Service Company of New Hampshire and that the statements therein are true to tne best of his knowledge and belief.
Moxdu 8 SQbw Beverly E.dilloway, Notary Pu6lic My Commission Expires: February 28, 1995
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