ML17263A532
| ML17263A532 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 02/01/1994 |
| From: | Andrea Johnson Office of Nuclear Reactor Regulation |
| To: | Mecredy R ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| GL-89-10, TAC-M87951, NUDOCS 9402070117 | |
| Download: ML17263A532 (6) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&0001 February 1,
1994 Docket No. 50-244 Dr. Robert C. Mecredy Vice President, Nuclear Production Rochester Gas and Electric Corporation 89 East Avenue
- Augusta, Maine 04336
Dear Dr. Hecredy:
SUBJECT:
GENERIC LETTER 89-10, SUPPLEMENT 5, "INACCURACY OF MOTOR-OPERATED VALVE DIAGNOSTIC E(UIPHENT" (TAC NO. H87951)
On June 28,
- 1993, the NRC staff issued Supplement 5, "Inaccuracy of Motor-Operated Valve Diagnostic Equipment," to Generic Letter (GL) 89-10, "Safety-Related Motor-Operated Valve Testing and Surveillance,"
requesting nuclear power plant licensees and construction permit holders:
(1) to reexamine their motor-operated valve (MOV) programs and to identify measures taken to account for uncertainties in properly setting valve operating thrust to ensure operability and (2) to evaluate the schedule necessary to consider the new information on HOV diagnostic equipment inaccuracy and to take appropriate action in response to that information.
Within 90 days of receipt of Supplement 5 to GL 89-10, licensees were required (1) to notify the NRC staff of the diagnostic equipment used to confirm the proper-size, or to establish
- settings, for safety-related HOVs and (2) to report whether they had taken actions or planned to take actions (including schedule) to address the new information on the accuracy of HOV diagnostic equipment.
You responded to Supplement 5 by letter dated September 28,
- 1993, and stated that you use HOV diagnostic equipment manufactured by ITI-HOVATS.
You stated that you previously used the ITI-MOVATS THD, but had switched to the ITI-HOVATS TTC, Stem Strain Ring (SSR),
and Stem Strain Transducer (SST).
You stated that 62 MOVs setup using the THD had been evaluated in spring 1992 and that 21 were found to be potentially inoperable.
You stated that eight HOVs 9402070117,940201.
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P PDR ImC RK CMem CS' 03003.8 The staff has reviewed the responses, and has found that, for the most part, licensees and permit holders have been actively addressing the uncertainties regarding the accuracy of HOV diagnostic equipment.
The increased inaccuracy of HOV diagnostic equipment can raise questions regarding:
(1) the adequacy of torque switch settings to provide sufficient thrust while not exceeding thrust or torque structural limits and (2) the capability of actuator motors at current settings.
In their responses, licensees and permit holders indicated that many HOVs had the potential for underthrusting or overthrusting as a result of the higher than expected inaccuracy of HOV diagnostic equipment.
Consequently, some licensees reported that HOVs have been
- retested, adjusted, or modified to resolve the concerns regarding the accuracy of MOV diagnostic equipment.
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Dr. Robert C. Hecredy February 1,
1994 had been tested during the 1992 outage; two HOVs had been evaluated and resolved with an engineering design analysis; six HOVs had been evaluated and had a potential to exceed the thrust limit; three HOVs had the potential for inadequate thrust and had been accepted based on differential pressure tests performed in 1991; and the two power-operated relief valve (PORV) block valves had been tested using the TTC in 1992.
During a future inspection, the NRC staff will discuss your resolution of the HOV diagnostic equipment accuracy issue.
Particularly, the NRC staff will discuss your basis for the statement that it had verified that degraded voltage stall thrust would not impede HOV actuator under reduced voltage.
The staff will also discuss your consideration of the potential effect on actuator thrust output from use of the TTC.
This completes all efforts on TAC No. H87951.
If you have any questions regarding this issue, please call me at (301) 504-1497.
Sincerely, cc:
See next page DISTRIBUTION:
NRC
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JLinville, RI Original signed by:
Allen R. Johnson, Project Manager Project Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation OF.F..ICE NAHE PD I-3
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Dr. Robert C. Hecredy February 1,
1994 had been tested during the 1992 outage; two HOVs had been evaluated and resolved with an engineering design analysis; six HOVs had been evaluated and had a potential to exceed the thrust limit; three HOVs had the potential for inadequate thrust and had been accepted based on differential pressure tests performed in 1991; and the two power-operated relief valve (PORV) block valves had been tested using the TTC in 1992.
During a future inspection, the NRC staff will discuss your resolution of the HOV diagnostic equipment accuracy issue.
Particularly, the NRC staff will discuss your basis for the statement that it had verified that degraded voltage stall thrust would not impede HOV actuator under reduced voltage.
The staff will also discuss your consideration of the potential effect on actuator thrust output from use of the TTC.
This completes all efforts on TAC No. H87951.
If you have any questions regarding this issue, please call me at (301) 504-1497.
Sincerely, cc:
See next page
/lien R. Johnson, P
ject Hanager Project Directorate I-3 l7Nision of Reac Projects - I/II Office ear Reactor Regulation
Dr. Robert C. Mecredy R.E. Ginna Nuclear Power Plant CC:
Thomas A. Moslak, Senior Resident Inspector R.E.
Ginna Plant U.S. Nuclear Regulatory Commission 1503 Lake Road
- Ontario, New York 14519 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Ms. Donna Ross Division of Policy Analysis
& Planning New York State Energy Office Agency Building 2 Empire State Plaza
- Albany, New York 12223 Charlie Donaldson, Esq.
Assistant Attorney General New York Department of Law 120 Broadway
'New York, New York 10271 Nicholas S.
Reynolds Winston 8 Strawn 1400 L St.
N.W.
Washington, DC 20005-3502 Ms. Thelma Wideman
- Director, Wayne County Emergency Management Office Wayne County Emergency Operations Center 7370 Route 31
- Lyons, New York 14489 Ms. Mary Louise Meisenzahl Administrator, Monroe County Office of Emergency Preparedness 111 West Fall Road, Room 11 Rochester, New York 14620