ML20199G061

Record of 860618 Telcon W/Nrc,Util,Bechtel & Westinghouse Re Deletion of Sump Additive Tank from Facility Design

ML20199G061
Person / Time
Site:	South Texas
Issue date:	06/18/1986
From:	Phelps J HOUSTON LIGHTING & POWER CO.
To:
References
NUDOCS 8606250006
Download: ML20199G061 (2)

Text

HOUSTON UGHTING & POWER COMPANY SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION

. TELEPHONE MINUTES COR RESP NDENCE SERIAL NUMBER M. R. Wisenburg N TO-J. S. Phelps SUBJECT FILE NUMBERS FROM:

June 18, 1986 PRIMARY: 09 17 SECON DA R Y -

DATE OF CALL.

Deletion of Sump Additive Tank From STP Design TELECON PARTICIPANTS. NRC H14P BECHTEL U UNCLUDE NAME ANo P. Kadambi J. Phelps J. Atwell B. Lorenz oncAsizATION OF E ACH T. Quay M. Powell R. Cook J. Grover PAGE OF L. Stouffer R. Payne K. Ruben L. Schlazer T. Roberson The NRC was contacted to discuss STP's proposed deletion of the su=p additive _

tank. During the discussion I described the differences between our proposed design change and ongoing Westinghouse owners Group (WOG) activities in order to emphasize our desire for timely review by the NRC. Prasad Kadambi had criginally indicated that STP's specific design change would be reviewed in conjunction with the WOG effort which has not been resolved.

The WOG is proposing that W plants be permitted to delete spray additives since, based on more recent source terms, additives such as NaOH were not necessary for maintaining acceptable dose levels. With the elimination of spray additives for dose considerations, the main concern becomes effects of spray on equip:nent (stress corrosion, hydrogen generation). The WOG expects that the sump pH level will be 7.0 or greater.

STP, on the other hand, is proposing to delete the sump additive tank (which was added to the design within the last year-and-a-half) but continue adding spray additives from the spray additive tank. The sump additive tank was originally added to the design to ensure that the sump pH remained above 8.5 (the SRP recommends a pH in the range of 8.5 to 10,5). By keeping the pH above 8.5, it can be assumed ,

that significant re-evolution of iodine will not occur when performing dose assesscent calculations.

Ll/Telmin/pb 8606250006 860618 PDR ADOCK 05000498 STP-103 U-E A PDR

HOUSTON LIGHTING & POWER COMPANY 3 SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION i 4 TELEPHONE MINUTES CORRESPONDENCE SERI AL NUMBER M. R. Wisenburg N/A TO-J. S. Phelps SUBJECT FILE NUMBERS FROM:

e 18, 1986 PRIMARY: 09 17 SECONDARY-DATE OF CALL:

g Deletion of Su=p Additive Tank From STP Design TELECON PARTICIPANTS. NRC HL&P BECHTEL W

~

ONCLUDE NAME AND

" P Gambif 4. J. Phelps J. Atwell B. Lorenz ORG ANIZATION OF E ACH' T. Quay M. Powell R. Cook J. Crover PAGE OF L. Stouffer R. Payne K. Ruben L. Schlazer T. Roberson U has determined that by deleting the sump additive tank, the pH in the sump __

could get as low as 7.5. Bechtel calculations

• demonstrated that a pH this low would result in slightly higher doses but that the increased dose levels were still within applicable regulatory limits. In addition, E (Bruce Lorenz) stated that deletion of the sump additive tank would make STP more like other E plants.

The NRC agreed that what we were proposing is different from the WOG efforts.

NRC stated that we should make a submittal describing our proposed design change along with a benefit cost analysis and the date by which we need the NRC to respond (for construction purposes). HL&P committed to provide the information necessary to support the NRC's re-review of this issue.

JSP/yd CC; L. W. Uotson J. N. Bailey C. A. Ayala W. R. Spezialetti (W)

D. H. Ashton (Bechtel)

Aelecon Participants l

Ll/Telmin/pb STP-103 (E 70