ML19269C877

LER 79-014/03L-0:on 790116,during Shutdown,Boric Acid Addition Tanks (Baat) Total Vol 3-1/3% Below Tech Spec 3.1.2.9 Requirements.Caused by Reduced Baat Vol After Completion of Required Testing Followed by RCS Boration

ML19269C877
Person / Time
Site:	Davis Besse
Issue date:	02/12/1979
From:	Marley J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19269C876	List: ML19269C875 ML19269C877
References
LER-79-014-03L, LER-79-14-3L, NUDOCS 7902200022
Download: ML19269C877 (3)

Text

NRC FORM 366 (7 773 LICENSEE EVENT REPORT

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ONTROL BLOCK: l l l l l l h (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) o i l o l n l o I B l S i l j@l 0 l o l- 10LICENSE l0 lN lP lF l- l0 l 325 l@l 4l LICENSE 1l 1l TYPE 1 JO 1l@lb l LAl T 58l@

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14 76 REPORT DATE 7 8 60 61 DOCKET NUM8ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o ! 2 l l On 1/16/79 during a unit shutdown, it was discovered that the Boric Acid Addition Tanky lol3l (BAAT) total volume was 3-1/3% below that required by Technical Specification 3.1.2.9 l o 4 lThis placed the unit in the Action Statenent of Technical Specification 3.1.2.9 , whichl o 5 l requires both BAATs be operable in Modes 1-4. The unit continued boration of the ]

l o o l Reactor Coolant System (RCS) to Cold Shutdown boron concentration and continued its o 7 g ooldown to Mode 5. The unit entered Mode 5 at 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br /> on 1/17/79, removing the l I

lolaj junit from the Action Statement. There was no danner to the public or unit personnel. 80 7 8 9 ^"

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li lo l lThe low BAAT volume was a result of a reduced BAAT volume af ter completion of reqtiired i

_j i i l testing followed by boration of the RCS for unit shutdown.

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-16_

DATE OF EVENT: January 16, 1979 FACILITY: 7 avis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Volume in boric acid addition tanks below Technical Specification minimum requirement The unit was in Mode 3, with Power (MWT) = 0, and Conditions Prior to Occurrence:

Load (Gross MWE) = 0.

Description of Occurrence: During the perf ormance and review of ST 5032.02, " Boric on January 16 1979 at 3

Acid Addition Tank (BAAT) Concentration and Volume Test" 1800 hours0.0208 days <br />0.5 hours <br />0.00298 weeks <br />6.849e-4 months <br />, it was discovered that the combined volume of the BAATs was below the ,

minimum volume required for the operability of the Boric Acid Addition System per10,667 Technical Specificc. tion 3.1.2.9. The volume of BAAT 1-1 was 4450 gallons at ppm and BAAT 1-2 was 1350 gallons at 10,923 ppm, giving a combined total volume of 5800 gallons which is 200 gallons below the Technical Specification requirement of  ;

6000 gallons.

Technical Specification 3.1.2.9 requires both the Boric Acid Addition System and If the Boric Acid Addition .

Borated Water Storagethe Tank be operable system must in Modes 1-4.be restored to operable status within 72 System is inoperable, or be in at least Hot Standby and borated to a shutdown margin equivalent to 1%

21 k/k at 2000F within the next six hours. The Boric Acid Addition System mustwithin be restored to operable status within the next seven days or be in Cold Shutdown the next thirty hours.

the time the Boric Acid Addition System was found inopera-The unit was in Mode 3 at The unit continued its ble, and was proceeding to Mode 5 f or required maintenance. System (RCS) to Cold S boration of the Reactor Coolant The unit entered Mode 5 at 1815 hours0.021 days <br />0.504 hours <br />0.003 weeks <br />6.906075e-4 months <br /> on and continued its cooldown to Mode thus removing 5.unit the from the Action Statenent of Technical January 17, 1979, Specification 3.1.2.9.

Designation of Apparent Cause of Occurrence: The apparent cause of the occurrence was the intentional entry into the Action Statement of Technical Specification 3.1.2.9 by the reduction of the BAAT's combined volume below the Technical Speci-fication requirements in order to borate the RCS to Cold Shutdown boron concentration for the planned unit shutdown.

Prior to the unit shutdown, the unit had recently concluded required operational testing which resul.ed in an abnormally high usage of boric acid, thus reducing the available supply of boric acid in the BAAT's.

LER #79-014

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-79-16 PAGE 2 Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. If needed, the Borated Water Storage Tank was available to introduce suf ficient negative reactivity to provide a cold shutdown margin of 1%

/lk/k.

Corrective Action: The operability of the Borated Water Storage Tank was verified on ST 5099.01 on January 16, 1979 at 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br />, which assured compliance with the Action Statement of Technical Specification 3.1.2.9. The unit continued with its planned cooldown to Mode 5. Once in Mode 5, the unit was removed from the Action Statement of Technical Specification 3.1.2.9.

Failure Data: There have been no previously reported similar occurrences.

LER #79-014