ML20148J645

Requests Implementation of Procedures to Prevent Reactor Coolant Pump Starts (or Jogs) While in Water Solid Condition When Steam Generator Temp Is Greater than RCS Temp.A Schwencer Encl

ML20148J645
Person / Time
Site:	Yankee Rowe
Issue date:	04/01/1977
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Groce R YANKEE ATOMIC ELECTRIC CO.
Shared Package
ML20148J649	List: ML20148J645 ML20148J652
References
NUDOCS 8011250177
Download: ML20148J645 (3)

Text

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. * (__ . l UE APR 1 577 vocket No. 50-29 -

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i's-Yankee Atomic Electric Company

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ATTN: fir. Robert H. Groce Licensing Engineer k _

20 Turnpike Road I" Westboro, Massachusetts 01581 Gentlemen:

RE: YAMXEE-RDWE ATOMIC POWER STATION A pressure transient recently occurred at an operating PWR facility when a reactor coolant pump (P,CP) was started while in a water-solid condition. At time, the temperature of the steam generator in that lot greater than the reactor coolant system (P,CS) temperature .d a pressure transient from about 400 psig to about 800 psig resulted.

In our February 16, 1977 letter we stated that all PWR licensees should include provisions to preycat RCP starts while in a water-solid condition. The purpose of such provisions is to prevent  ;

pressure. transients due to temperature af fferentials within the RCS.

We also stated that should it become necessary to start a p,CP while water-solid, appropriate steps are to be taken to determine and minimize the temperature profile. Such action was not taken prior to the recently reported event.

Based on this recent pressure transient and our review of PHR subnittals describino RCP operating procedures, we are concerned that the siqnificance of this event may not be fully realized.

We, therefore, now request that you implement procedures to prevent RCP starts (or 'iogs") while in a water-solid condition when the steam [

generator tosporature is greater than RCS temperature. In the event that a RCP start while water-solid cannot be avoided we request that your plant operatino procedures include non-optional pre-requisite steps to ensure that the P.CS temperature profile is determined and ,

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if that profile is excessive, that appropriate neasures are specified to acnieve an acceptable profile prior to starting a RCP. q

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We further request that these procedures be implemented immediately, 'F and that they. remain in effect until we have received and approved

!'j an analysis justifying any deviations from these. provisions. You =.si are requested to advise us within 15 days of receipt of this letter ... '";;)

that you have implemented the provisions discussed above. E ~

Fi In addition, it is.strongly' recommended that you immediately conduct Fi a critical review of your procedures to ensure that they are fully 3

.::i responsive to all of the positions stated in our letter of February 16, f5 1977 and compatible with the pertinent results of your RCS pressure ~ 9 response analysis.

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Sincerely, g tj]

Original Signed By g A. Schwencer, Chief $:

Operating P,eactors Branch #1 [.5 i:1 Division of Operating Reactors '

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