ML19317G874
| ML19317G874 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/31/1975 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Purple R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19317G875 | List: |
| References | |
| 87037, NUDOCS 8004020536 | |
| Download: ML19317G874 (3) | |
Text
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NRC DIST..!UTION FOR PART 50 DOCKET M/
- RIAL (TEMPORARY FORM)
FILE:
F ROM: SACRNEhIO MUNICIPAL ITIIL. DATE OF DOC DATE REC'D LTR TWX RPT OTHER Srcramento, Calif J J Marirce 7-31-75 8-19-75 H
ORIG CC OTHER SENT NRC PDR TO:
M Mr Purple one signed SENT LOCAL PDR CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKEY NO:
1 50-312 XXXXX ENCLOSURES:
DESCRIPTION:
Ltr thans the following:
Proposed tech specs change re out 7-1-75 ler 1 D @ 9I
...... furnishing info concerning tech specs change with regard to SNUBBERS.....
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)SMUD SACRAMENTO MUNICIPAL. UTILITY DISTRICT C 1708 59th Street, Box 15830, Sacrarnento, California 95813:(916)452-3211 July 31, 1975
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Robert A. Purple, Chief Operating Reactors Branch No. 1 ff Division of Reactor Licensing Nuclear Regulatory Commission Washington, D.C.
20555 Re: Robert A. Purple to E.K. Davis Lecter dated July 1, 1975
Dear Sir:
In reply to the above referenced letter, enclosed is the proposed amendment to our Technical Specifications based on the requirements stated in the model specifications. However, some statements are necessary in order to describe the hydraulic shock suppressors at Rancho Seco r.nd the high reliability we have observed in order to justify the contents of the proposed Technical Specification amendment.
The hydraulic shock surpressor system at Rancho Seco consists of 97 Bergen-Patterson and 38 Grinnell units on Class I components. All suppressors have been inspected, tested and altered according to previous IE Bulletins Nos. 73-3, 73-4 and 75-5.
A technical specification was added to the Rancho Seco license requiring specific testing requirements.
The tests to date include ten complete inspections of the accessible units totaling 580 individual inspections and five complete inspections of the inaccessible urits totaling 385 individual inspections. Of the 965 total inspections, only three sn'ubbers have been found to have a film of oil around the reservoir seal.
None of the suppressors indicate oil leakage through the plunger seals. All inspections have concluded that there have been no failures at Bancho Seco since initiating the surveillance program.
ThesurveillanceprogramrequiredbyParagraph-(14,"SafetySystems Hydraulic Snubbers", of our Technical Specifications.protides for routine inspection of all units for evidence of hydraulic fluid' leakage and a periodic evaluation of seal condition.
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AN ELECTRIC SYSTEM SERVING M0RE THAN 600.000 IN THE HEART CF Caltf0RNiA
- Robert A. Purple, Chief Operating Reactors Branch No.1 July 31, 1975 We do not propose to institute a test program requiring the removal of suppressors for bench testing to verify the ability of the unit to
" lockup".
It is our opinion that the design of the hydraulic control device is such that it is not. subject to setpoint drift without a related breakdown or failure of components. The shop testing verified the proper selection of orifice sizes and poppet _ valve spring rates.
If any component degradation is occurring it will be detected during the inspections required by our cc.rrent surveillance procedure which will remain in effect until NRC app'. oval of proposed Technical Specification Amendment No. 38, which is attached to this letter.
Respectfully,
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t J. J. Mattimoe Assi1 tant General Manager and Jhief Engineer 1
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