ML20084E416

RO:700108,during Draining Required to Permit Replacement of Coolant Temp detectors,in-core Thermocouple Reading Indicated Temp Exceeded Tech Spec Limit.Caused by Failure to Monitor Temp by Alternate Means

ML20084E416
Person / Time
Site:	Ginna
Issue date:	01/19/1970
From:	Nelson E ROCHESTER GAS & ELECTRIC CORP.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8304150058
Download: ML20084E416 (2)

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ROCHESTER GAS AND ELECTRIC CORPORA Tion u :) CAST ? vet:UL, dut' HEE.TEf:, in 14 />4

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3- , January 10, 1970

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~ Dr. Futer A. Morris, Director 6./

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Divinicn of Reactor Licensing ~ B

• C' United Statea Atomic Energy Commission \ '<,T, 2P* G J j -

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Wacchincton, D. C. 20545

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'.': > O Dubject: Violation of Cent?inment Integrity, January 0, Ido N ,,'ly2,7 ,QTk,A s 1

' Ginna Ctation Unit No.1 ~

Docket 50-244

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Dear Dr. Morris:

i, The reactor plant vraa tsen to a ecid shutdown condition on 5 l January 8,1970 in preparaticu for the replacement cf cix failed reactor ecolant temccrature detectore (RTD tym) and for work on the "D" reactor ((

i coolant pump. Circulation How from the Residual Eeat Reu. oval ."yatam {l wac stopmd at0 1C25 hoa/s. At 1500 houra,and with tho reactor cookmt '

nyctem at 100 F, the Puft icreman gave permission for both peconnel i air lock doorc to be cuenea to ty rnit 'la.v of tools and eauipment for the MEuntenanCe planneQ.

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+ i, i n To faellitate rem 7/al of the RTD'e, partial draining of the reactor Wh# -

roclant system is reatired and this step v/as initiated at 2310 houra. M '

Draining was hele to a niinimum rate for control and curveillane2. When I indicationa were that the , reactor ecolart level viau below the RTD location, .i.

the drainage wau terminatea. This was reported as of the hour of 0135 on  ;;

the morning of January 9,1070. '

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At 0500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> on .innuary 9,1070 it was found that the reactor f

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oiant cyatem level still ecvered the lower RTD and m are drainage ww i; required to termit replacen'ent of the RTD's. Additional drniniruJ waa in proceau when incore thermocouple readi .

temperature readings rann.ina. from 175',na.s taken at 1030 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91915e-4 months <br /> indicated 4

-F to le5"F. Theco temoeraturen I

exceeued the temperature limit for cold chutdown of 140U F nnd to be in II accordance with the Technical Spacification, contanunent integrity ahould have been in effect. One perconnel access door was immediately closed  ;'

and the peraonnel air lock doors were returned to their normal interlocking -

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i condition within,an hour. '

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! COPJ SENT REGION ~$

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8304150058 700119 JAN 26195 -

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