ML19210A651

Discusses Adequacy of TMI-1 Safeguards to Prevent Boron Dilution Accidents Created by Operator Errors or Multiple Valve Failures During Power Operations W/Reactor Head in Place Per FSAR Chapter 14

ML19210A651
Person / Time
Site:	Crane
Issue date:	12/16/1977
From:	Herbein J METROPOLITAN EDISON CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
GQL-1707, NUDOCS 7910300682
Download: ML19210A651 (2)

Text

DISTRI3UTION IJTER ISSUANCE OF OP' TING LICENSE u.s. NuctaAm macuLAromv e, is 4

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/5IbdCO Advising it is felt that the TMI-1 FSAR, in Chapter 14, l

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prevent boron dilution accidents.

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Dear Sir:

Th."ee Mile Island Nuclear Station, Unit 1 Operating License No. DPR-50 Decket No. 50-289 The TMI, Unit 1 FSAR, in Chapter ik, discusses the potential for, and the termination of, boron dilutien accidents created by operator errors or multiple valve failures during power cperations with the reactor head in place. This chapter also covers potential accidents occuring during refueling and maintenance operations with the head removed. Hevever, one potential accident not covered in this chapter is boron dilutien by a Sodium Hydroxide (NaCH) injection during operation of the Decay Heat Removal System.

The I'4I-l Decay Heat Removal System procedure requires opening the breakers for both NaOH E.S. motor operated isolation valves. This action prevents in-advertent opening of the valve due to operator error. The TMI-1 plant cooldevn procedure requires closing and tagging the manual valves upstrea= of the E.S.

otor operated isolation valves. The perfcrmance of these procedures, as required prior to operatien of the Decay Heat Removal System, results in redundant isolation between the Na0H tank and the Decay Heat Re=cval System.

Therefore, it is felt that TMI-l provides adequate safeguards to prevent boren dilution accidents.

Sincerely, 0

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, J. G. Herbein

/ Vice President k

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