ML19259C223

LER 79-037/03L-0 on 790517:during Cold Shutdown,Technicians Inadvertently Set Isolation Trip Setpoint of Alarm Units 2G31-K603A&B for Leakage Flow of 134 Gallons/Minute. Caused by Incorrect Procedure.Procedure Revised

ML19259C223
Person / Time
Site:	Hatch
Issue date:	06/01/1979
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19259C221	List: ML19259C220 ML19259C223
References
LER-79-037-03L, LER-79-37-3L, NUDOCS 7906140424
Download: ML19259C223 (1)

Text

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U. S. NUCLE AR REGULATORY COMMISSION NRC FORM 366 (7 771 LICENSEE EVENT REPORT (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION!

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EVENT DATE 74 7b REPORT D AT E 80 7 8 60 61 NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o l 2 l lDuring normal surveillance with the unit in cold shutdown, technicians performed l o 13 l HNP-2-3501 reactor water clean-up differential flow FT&C. Due to an error in the j

o 4 l procedure, the technicians inadvertently set the isolation trip setpoint of alarm o s units 2G31-K603A&B for a leakage flow of 134 GPM. The tech spec limit is s 79 GPM l

/* l o s l (Table 3.3.2-2 item 3a) . The plant was in condition 4 (cold shutdown) and the RWCU l

1017 ] ldif ferential flow system was not required to be operable. Public health and safety l

O 8 Iwas not affected. 80 S BC E COMPONENT CODE SUB ODE S DE DE CODE o 9 l Il Bj@ lD l@ {@ l Il Nl S l Tl Rl U j@ y@ y @

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33 34 35 M 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1110llThe formula for determination of leak flow on procedure HNP-2-3501 was stated as i i " Leak Flow = Qi - (Q2 + Q3)". It should have been " Leak Flow = Q1 - (Q9 + Q3)".

l g,,7; lWhere Qi = RWCU system inlet flow, Q7 - RWCU system return flow and Q3 = RWCU blow-l

, 3 l down flow to radwaste. Procedures HNP-2-3501 and 5207 were revised and the FT6C was l

i 4 ldone successfully.

7 8 9 Dis O RY DISCOVERY DESCRIPTION STA S  % POWE R oTHER STATUS N/A [Bj@l Surveillance Test l i 5 W@ 0l 0l 0]@l l ACTIVITY CONTENT toCAisON oF RELE ASE RELE ASED of RELE ASE AMOUNT OF ACTivlTY N/A l 1 6 [2_] h (Z,j@l '

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1 H 8 9 l0l0l0l@l 11 12 30 LOSS OF OR DAMAGE TO FACILITY M TYPE oEScaiPTiON U 790614 Oe/$14/

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. T. Nix, Supt. of M ntenance PHONE: $