ML19322C547

Poses Questions Re Classification of & Changes to Power Operated Relief Valve

ML19322C547
Person / Time
Site:	Crane
Issue date:	08/06/1979
From:	Deyoung R NRC - NRC THREE MILE ISLAND TASK FORCE
To:	Gossick L NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
References
TASK-TF, TASK-TMR NUDOCS 8001170875
Download: ML19322C547 (2)

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k August 6, 1979 In Reply Refer to:

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Lee V. Cossick, Executive Director for Operations 3

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Richard C. DeYoung, Deputy Staff Director NRC/TMI Special Inquiry Group SUSJECT:

Ttil ACCIDENT PRECURSOR

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On Iacch 29, 1973, fail open due to a loss of control po.ser.an incident occurred at Ti1I-2 that caused i

1 cicse on loss of control power.the licensee proposed changing the plant d

'i Sectiuns 7.4.1.1.5 and 7.7.1.1) seems to imply that although the PORV hj and the autcmatic control system are not safety related, the nanual con-

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trol system is required for safe shutdown and should be classified as safcty related equipment.

In cddition that the safe shutdown analysis assumes, Section 7.4.1.1.6 seems to imply that the PORV will fail open on y ' g loss of control power.

Dased on licensing practice that existed in 1973:

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Should the PORV manual control system have been classified Il as a safety related system?

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Mas the PORV manual control system classified as safety related i.

equipment?

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Uhat does classification as " safety related equipment" im

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Has the NRC aware that the PORV had been chanced to fail snut Sb on loss of control power?

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Uhat analyses and/or licensing actions, if any, should have taken place before the licensee chanced the PORV to fail shutD y

i on loss of control power?

letter to fir. D. H. Grier, IE:RI, dated June (See Metropolitan Edison Compan LN_

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before the char.ge discussed in 4. cbove was made?!.' hat a i

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1 Lee V. Gassick 2

August 6, 1979 I

If ycu hcVe any questions ccncerning this natter, please cent 6ct rred Hebdon (492-8947) of my staff.

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flichard C. DeYoung, Deputy Staff Director i

NRC/TMI Special Inquiry Group.

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