ML19343B058
| ML19343B058 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 08/18/1975 |
| From: | Vandenburgh D YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-75-87, NUDOCS 8011250236 | |
| Download: ML19343B058 (4) | |
Text
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Proposed Change No. 128 Regulatory Doc $iFG' -
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%, M'I*4 August 18,3 5-United States nuclear Regulatory Commission Washington, D. C.
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Attention: Office of Nuclear Reactor Regulation 4
Reference:
1.
License No. DPR-3 (Docket No. 50-29) 2.
USNRC Letter dated June 30, 1975.
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Cear Sir:
Pursuant to Section 50.59 of the Commissions's Regulations, Yankee Atcmic Electric Ccmpany hereby requests to make the following change:
FRCFCSED CHANGE: We propose to incorporate in the Technical Specifications, Appendix A of the referenced license, a section relative to hydraulic snubbers.
FJ_'_SCM FCR CHANC-E : Requirements of Reference 2.
DISCRIPTION CF CHANGE: Add the following section under Paragraph F, hence-
" Orth to be designated Limiting Conditions for Operation and Surveillance i.equire.ents, of the Technical Specifications. This Section to be numbered l
F.2 and entitled FYDPAULIC SNUEEERS. The present Section under Paragraph F entitled RCD DRCP TI'E should be renumbered F.1:
F.2 HYDFAULIC St."JEEERS LIMITING CCNDITIONS FOR OPEFATION l
During all modes of cperation except Cold Shutdown, all hydraulic l
snubbers required to protect the primary coolant system or any other safety related system or component shall be operable except as described below.
Reactor operation is only permitted for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after the a.
I time a hydraulic snubber is determined to be inoperable unless sooner repaired.
I b.
If the requirements of "a" cannot be met, an orderly shutdown shall be initiated and the reactor shall be in a cold shutdown condition within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
0938 80 1.125oJ3G
i United States Nuclear Regulatory Commission August 18, 1975 Attn: Office of Nuclear Reactor Regulation Page Two APPLICA5:LITY: All modes of operation except for Cold Shutdown.
SURVII O.NCE REQUIREMENTS The fc11 wing surveillance requirements shall apply to all hydraulic snubbers required to protect the primary coolant or any other safety related system or component.
All hydraulic snubbers shall be visually inspected at least a.
cnce per core cycle. A record shall be kept of each inspection.
b.
Follcwing a severe transient condition, all the hydraulic snuhbers attached to the affected system will be inspected within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or prior to return to power operation.
Cnce each refueling cycle, a representative sample of 10% of c.
the snubbers shall be functionally tested for operability including verification of proper pisten movement, lock-up and bleed. For each snubber tested that proves inoperable, an addicional 10% of the snubbers shall be functionally tested until no more failures are detected. Samples for testing shall be chosen so that all snubbers will eventually be tested.
SAFETY CCNSICERATIONS: Hydraulic snubbers have been installed to prevent unrestrained pipe motion under dynamic loads as might occur during severe transients, while allowing normal thermal motion during startup and shut-down. The censequence of an inoperable snubber is an increase in the probability cf structural damage to piping in the event of a severe transient.
Because snubber protection would only be required during low probability severe transients, a period of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> is allowed for repair or replacement.
An additicnal 26 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br /> would be acceptable to reach cold shutdown conditions if a repair er replacement could not be made in the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
All safety related hydraulic snubbers are visually inspected for overall integrity and cperability. The inspection will include verification of proper crientation, adequate hydraulic fluid level and proper attachment of snubber te piping and structures.
The inspection frequency is based upon using snubbers having proven seal materials. The additional inspection required following a severe l
transient ccndition, augments the core cycle inspection and is not intended l
to replace it.
Documentation of each inspection will preclude not inspecting each snubber.
Functicnal tests performed on representative. snubber samples are designed to detect pctentially inoperable snubbers. These tests will include stroking of the snubber to verify proper piston movement, lock-up and bleed. Those that fail "-= '"--tional test will be completely disassembled and checked for ccmpene-- #=~=ge and seal degradation.
P092 R ENAL
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United States Nuclear Regulatory Commission August 18, 1975 Attn: Office of Nuclear Reactor Regulation Page Three This Proposed Change has been reviewed by the Nuclear Safety Audit and Review Committee.
SCECTLE OF CHANGE: The requirements of the proposed change will be implenented pending approval during our next major, shutdown scheduled for Cetcher-Neverter, 1975.
Respectfully submitted, YANKEE ATOMIC ELECTRIC COMPANY 4
D. E. Vandenburgh Vice President CO:0'C:G.T.ALTH OF MASSACHUSETTS)
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COUNTY OF WOECESTER
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Chen personally appeared before me, D. E. Vandenburgh, who, being duly swern, did state that he is a Vice President of Yankee Atomic Electric Ccepany, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Yankee Atomic Electric Company, and that the statements therein are true to the best of his knoaledge and belief.
K m/
Armand R. Soucy Notary Public My Commission Expires September 9, 1977
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NRC Di
.IIBUTION FOR PART 50 DOCKET [TERIAL (TEMPORARY FORM)
CONTROL NO: T? 9 3 b FILE:
FROM: Yankee Atc=ic Elcetric DATE OF DOC DATE REC'D LTR TWX RPT OTHER Westborough, Mass 8-18-75 8-22-75 XXX
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ORIG CC OTHER SENT NRC PDR xx NRC 3 signed
'SENT LOCAL PDR XX CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
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50-29 DESCRIPTION:
ENCLOSURES:
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Andt to OL/ Change to Tech Specs ting of proposed change #128 con yNUBBERS......
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