ML20104B946
| ML20104B946 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 09/11/1992 |
| From: | Shields J COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9209170012 | |
| Download: ML20104B946 (3) | |
Text
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September 11,1992 Dr. Thomas E. Murley, Director C'fice of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 Attn: Document Control Desk
Subject:
LaSalle County Station Units 1 and 2 Inservice Testmg Program Revisad Relief Request RV-26 NBC.DocketNosm50-373_and_50:37A Referencos:
(a)
C.M. Allen (CECO) letter to USNRC, dated July 28,1987, inservice Testing Program for Pumps and Valves (b)
Paul C. Shemanski (USNRC) letter to Henry E. Bliss (CECO),
aated August 16,1988, Safety Evaluation Report and Relief of the Inservice Testing Program for Pumps and Valves (c)
W.E. Morgan (CECO) letter to Dr. Murley (USNRC), dated October 2,1989, submitting Revision 2 of the IST program (ri)-
M.A. Ring (USNRC) letter to Cordell Reed (CECO), dated July 29, 1992, transmitting Inspection Report 50-373/92015 and 50 374/92015
Dear Dr. Murley,
in the reference (a) submittal, Commonwealth Edison (CECO) provided the 3roposed IST program for LaSalle County Station. Relief request RV 26 was included n this submittal, and requested relief from the quarterly exercising frequency and the stroke timing of valves 1(2)C11-F380 and 1(2)C11-F388, the control rod drive scram discharge. volume instrument vents, and 1(2)C11-F381 and 1(2)C11-F389, the control rod drive scram discharge volume instrument drains. In lieu of individually stroke timing each valve quarterly, CECO proposed alternate testing of exercising each valve quarterly, and stroke timing the slowest valve every refuel outage.
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W Dr. Thomas E. Murley September 11,1992 in section 4.9.1.2 of reference (b), the NRC stated that CECO had not demonstrated the impracticality of individually stroke timing each valve. In the reference (c) submittal, CECO revised the alternate testing oli relief request RV-26 to include full stroke exercising of these valve quarterly, without stroke timing.
As discussed in reference (d), during an NRC IST Inspection CECO agreed to individually stroke time the scram discharge vent and drain valves on a refueling outage frequency. Atteod !s a revision to relief request RV-26, which clarifies that the alternate testing will be to exe,O: 'bc valves quarterly without timing, and to individually stroke time the va;ves each refuel outage.
if there are any questions, please call this office.
Respectfully, 1w JoAnn Shields Nuclear Licensing Administrator Attachment cc: A.B. Davis, Regional Administrator - Rlli
- B.L. Siegel, Project Manager - NRR D.L. Hills, Senior Resident inspector - LSCS Office of Nuclear Facility Safety-IDNS b
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.LASALLE COUNTY STATION UNIT # 1 and 2 VALVE RELIEF REQUEST /
COLD SHUTDOWN JUSTIFICATION:
RV-26 APPROVAL / REFERENCE DOCUMENT (S) : SER dated August 16, 1988 AFFECTED COMPONENT (S):
COMPONENT EPN CLASS / CATEGORY FUNCTION 1(2)C11-F380 2/B CRD Scram Discharge Tast Volume Vent 1(2)C11-F381 2/B CRD Scram Discharge Inst Volume Drain 1(2)C11-F388 2/B CRD Scram Discharge Inst Volume Vent 1(2)C11-F389 2/B CdD Scram Discharge Inst Volume Drain ASME SECTION XI TEST REQUIREMENT: Full Stroke and Stroke Time, Quarterly BASIS FOR RELIEF:
During reactor operation the scram discharge volume vent and drain valves operate in pairs and cannot be stroke timed with any repeatability because of the bleed valves installed in the supply (-F383) and exhaust lines (-F384), which are adjusted to control the sequencing between the upstream and downstream vent and drain valves.
The -F380 and F381 (downstream) valves are adjusted to close after the -F388 and -F389 (upstream) valves during a full core scram.
When the full core scram is reset, the -
F380 and -F381 valves are adjusted to open after the -F388 and -
F389 valves.
This is designed to prevent locking in pressurized air or water between the redundant vent or drain valve.
In order to measure the individual valve stroke time a strip chart recorder (s) would need to be hooked into the electrical circuit of u
each valve, this in itself requires a number of man-hours because of the necessary procedural first and second verifications involved with lif ting and landing leads to alleviate personnel errors.
This elaborate timing set up would not provide any relevant data indicative of valve performance or condition, since the bleed rates themselves are not consistent.
Full stroking of these valves quarterly will be cufficient to adequately assess their operational readiness.
ALTERNATIVE TEST:
Full stroke exercise quarterly without timing.
Valves will be individually stroke timed on a refueling outage frequency.
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