ML052620148

E-mail from M. Gray of USNRC to A. Passarelli of USNRC, Regarding Faxed Portion of the Allegation Response

ML052620148
Person / Time
Site:	Hope Creek
Issue date:	07/08/2004
From:	Mel Gray Reactor Projects Branch 3
To:	Passarelli A NRC/RGN-I/DRS/PSB2
References
FOIA/PA-2004-0314
Download: ML052620148 (1)

Text

I Anne Passarelli - Regarding faxed portion of allegation response Page I1I Anne Passarelli - Regarding faxed portion of allegation response Page 1N From: Mel Gray To: Anne Pas arelli Date: 7/8/04 9:56AM

Subject:

Regarding faxed portion of allegation response Anne, You asked if PSEGs response to an allegation regarding recirc pump aux impeller "made sense." Anser for me is yes.

The aux impeller is located on the B recirulation pump shaft and spins with shaft. It serves to drive reactor coolant water in the seal cavity area through tube side of mechanical seal heat exchangers. Shell side of htx cooled by RACS.

The fact that there is indication of a rub between aux impeller and stuffing box means the recirc shaft may be bowed, as PSEG has already concluded. The shaft may not be rubbing at normal 100% flow conditions. Then again it may be. But recirc pump vibration is monitored as is seal performance (leakoff and dp across seals). So the problem is monitored.

It is indeed a business decision on how long to run with this condition. I don't the rubbing condition itself will cause a potential sudden seal failure, but the problem has shown itself in premature seal failures at HC and one forced outage. Outages and downpowers are monptired by NRC Pls. So although a business decision, if it impacts safety via initiating events increase, we will see it.

Mel Gray (Plan to charge about 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> to allegation support!)

CC: Scott Barber C3