ML18079A913

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Supplements 771227 Response to IE Bulletin 77-04 Re Unresolved Item 50-272/78-08-03.Discusses Content of Spray Additive Tank Upon Actuation of Containment Spray Sys & Acid Concentration in Refueling Water Storage Tank
ML18079A913
Person / Time
Site: Salem PSEG icon.png
Issue date: 08/13/1979
From: Schneider F
Public Service Enterprise Group
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 7909120587
Download: ML18079A913 (3)


Text

Frederick W. Schneider Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/430-7373 Vice President Production August 13, 1979 Mr. Boyce H. Grier, Director

u. s. Nuclear Regulatory Conunission Off ice of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

NRC IE BULLETIN NO. 71-04 UNRESOLVED ITEM 50-272/78-08-03 NO. 1 UNIT SALEM GENERATING STATION Pursuant* to NRC unresolved item 50-272/78-0S-03 concerning our response of.December 27, 1977 to the subject Bulletin, we offer the following revised response.

Upon actuation of the Salem Containment spray system the contents of the spray additive tank (sodium hydroxide NaOH) are mixed into the spray stream to enhance the iodine.removal capability of the containment.spray system. This is the primary purpose of NaOH addition. The Salem Unit #1 has a spray additive tank capacity sufficient to contain enough sodium hydroxide solution which, upon mixing with borated water from the boron injection tank,

.refueling water storage tank (RWST), the accumulators and the

'primary coolant system, will bring the concentration of sodium hydroxide in the containment sump to approximately 0.2 weight percent solution and 1.2 weight percent boric acid. This maintains a pH of at least 8.5 and assures the continued iodine removal effectiveness of the spray during the recirculation phase of operation as well as adequate retention of the absorbed iodine in the sump liquid.

Mr. Boyce H. Grier 8/13/79 Salem Unit #1 technical specification presently requires a minimum water volume of 350,000 gallons at a minimum boron concentration of 2000 ppm in the RWST, and a minimum volume of 30% by weight NaOH solution in the spray additive tank. The technical specification for Salem Unit #1 does not have an upper limit for the boron concentration in the RWST. However, Salem 1 has been maintaining a boron concentration of 2100 ppm (Nominal) in the RWST (as borne out by periodic sampling) consistent with the previously specified chemical parameters. A level indicating alarm is provided in the control room, if, at any time the spray additive tank contains less than the required amount of NaOH solution. Periodic sampling confirms that proper NaOH concentration exists in the tank. Also, flow indication is provided to alert the operator if there is low . I flow from the tank. '

I To give the plant operator a wider latitude in maintaining the required boric acid concentration in the RWST, we plan to set an upper limit for boron concentration in the RWST at 2500 ppm for Salem Units 1 and 2. It is proposed to revise the technical specification for Unit 1 (Unit 2 has incorporated these revised limits) to reflect the following changes to conform to the proposed maximum boron concentration in the RWST.

Revised Limits

  • Min. Max.
  • RWST Volume (gallons) 350,000---400,000 RWST Boron Concentration (ppm) 2,000-'.""---2,soo NaOH Volume (gallons) 2,568-----4,000 RWST-Low Alarm Volume (gallons) 158,000 at switchover to recirculation The.containment sump pH with the revised limits will be 8.5.or greater under post-LOCA conditions. Also, the minimum operator action time
  • L. ,~**

Mr. Boyce H. Grier 8/13/79 for switchover from injection to re6irculation with all safeguard pumps running will.be changed from 17 minutes to approximately 14 minutes. The above changes will :Oe implemented on NRC approval of the proposed changes for Salem Unit #1.

Sincerely,

~~