ML19309F358
| ML19309F358 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 04/17/1980 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Reid R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19309F359 | List: |
| References | |
| NUDOCS 8004290338 | |
| Download: ML19309F358 (2) | |
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Tetch 9
8" 8" 8
$SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT C 6201 S Street, Box 15830, Sacrameato, California 95813; (916) 452-3211 April 17, 1980 Mr. Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington D.
C.,
20535 Re: Rancho Seco Nuclear Generating Station ISI/IST Program
Dear Mr. Reid:
Operational review for implementat'on of the IST Program submitted to you on July 18,1979 (and amended in a submittal to you on December 13, 1979) has brought several areas to light in which we cannot perform testing as described in our submitta'..
The purpose of this letter is to explain the program changes whir we feel are neces-sary and to transmit additional Requests for Relief co you.
These changes were discussed with Messrs. Vic Nerses and Alan Wang of your staf f on April 10, 1980. As neither of these gentle-men foresaw any problems with the changes we are proposing, these changes will be implemented immediately.
Further, as was explained to Messrs.
Nerses and Wang, our operational implementation review will continue.
If additional problem areas are discovered, Mr. Nerses will be contacted and additional program changes and Requests for Relief submitted as neces-s a ry.
Item 1: The valves listed below are System Control, Vent and Sample valves on the Pressurizer. These valves are not safety re-lated and will, therefore, be removed from the program. No Request for Relief is nec!ssary.
Replace Pages 4-1 and 4-2 in the Rancho Seco 19T Program with Pages 4-1, Rev. 1, and 4-2, Rev. 1, attached.
PV-21509 - Prz. Spray PV-21520 - Prz. Spray Bypass HV-21510 - Prz. Spray Iso.
HV-21515 - Prz. Vent Iso.
HV-21516 - Prz. Liquid Sample Iso.
Item 2: The valves listed below are valves which isolate Main Steam from Reheaters. Since there are no > bin Steam Isolation Valves at Rancho Seco, the valves listed are essentially Containment Isolation Valves; however, they do not receive an automatic SFAS sig 11 to close.
f)4 Stroking these valves during power operation is not desirmsle due to the 7 \\
introduction of thermal cycles on the Moisture Separator Reheater tube A1 ELECTRIC CY37EM S E R ii 13 MORE T 1 A :, 600.00] 11 inE HEAli of ;AtiF: RNIA
Mr. Robert W. Reid U. S. Nuclear Regulatory Commission Page 2
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bundles. Therefore, the test frequency of Full Stroke Testing and Timing will be changed from Quarterly to Cold Shutdown.
Replace Pages 4-26 and 4-27 with Pages 4-26, Rev.1 and 4-27, Rev. 1, attached.
In addition, add PV 45, attached.
HV-20598 "B" MS to Reheaters Iso.
HV-20597 "A" MS to Reheaters Iso.
Item 3: The valves listed below are Atmospheric Dump and Turbine Bypass Valves. These valves are utilized to facilitate and control plant cooldown as well as to control Main Steam Header pressure. To stroke these valves during power operation requires that they be isolated.
In addition, the valves must be isolated in groups (For instance: all three Atmospheric Dump Valves or both Turbine Bypass Valves on each side) because all valves in a group are controlled and moved together. This greatly reduces the ability of the operators to control heatup/cooldown rates or to maintain a desired Main Steam Header pressure. Therefore, the test frequency of Full Stroke Testing and Timing will be changed from Quarterly to Cold Shutdown.
The pages listed above in Item 2 and Pages 4-24, Rev.1, 4-28, Rev.1 and 4-29 Rev. 1, attached, revise the requirements for these valves. Add PV 46, attached.
PV-20566 -
B" Turbine Bypass PV-20564 - "B" Turbine Bypass PV-20562A "B" Atmospheric Dump PV-20562B "B" Atmospheric Dump PV-20562C "B" Atmospheric Dump PV-20571A "A" Atmospheric Dump PV-20571B "A" Atmospheric Dump PV-20571C "A" Atmospheric Dump PV-20561 - "A" Turbine Bypass PV-20563 - "A" Turbine Bypass If you have any questions, please feel free to contact Mr. Ron Colombo of my staff at Rancho Seco.
Respectfully submitted,
,A A,
r
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plLm
/h J. Shttimoe, Assistant Ceneral Manager and Chief Engineer JJM:WBG: bks i
Attachmen t