ML20077A034

Supplemental Ro:On 830604,13,14 & 15 Standby Gas Treatment Train B Declared Inoperable.Caused by Increased Damper Closure Since Measurements Made in May 1983.Dampers Returned to Preset Position

ML20077A034
Person / Time
Site:	Browns Ferry
Issue date:	07/12/1983
From:	Green H TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
RO-50-259-83035, NUDOCS 8307220111
Download: ML20077A034 (6)

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TENNE @gg5 C Vpt.g AUTHORITY cwATIAh66aA,. renyypfkg svaa, 1750 Chestnut Street Tower II July 12, 1983 # I4 All: 07 Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Commission Suite 2900 101 Marietta Street, NW Atlanta, Georgia 30303

Dear Mr. O'Reilly:

TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNIT 1 - DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BFRO-50 _259/83035 The attachment to the enclosure was inadvertently omitted from my letter to you dated July 11, 1983 We are submitting the attachment at this time.

Very truly yours, TENNESSEE VALLEY AUTHORITY AW j H. J. Greenf Director of Nuclear Power Enclosure oc (Enclosure):

Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Records Center ,

I Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 NRC Inspector, Browns Ferry G307220111 830712 DR ADOCK 05000 500 An Equal Opportunity Employer g

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(BFRO-50-259/83029)

During SGT "B" oper- SWS ability SI (4.7.B.1) Ril failed to operate MR given to EM Damper 0-65-503 adjusted so that F.S. & Rif operated -

Flow good

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• TIME EVENT CONSEQUENCE COMMENT (6/13/83) 0850_ SI 4.7.B-2 in progress (1) U0 Log 1600 SI 4.7.B-2 (SBGT by (1) U0 Log elect.) in progress 2130' SGBT train B declared (1) U0 Log inop per B0P SE RH (1) SE Log heater no - operation- /

SI's in progress on A+C train electricians having trouble with SI 4.7.B relative humidity htr for "B" i SBGT fails to start on air flow switch on auto.

Declaring inop & running A&C. SBGT per T.S. '

reported to Ri! and JES Stiles to write LRED.

Had 2 hrs. to demon.

operability on A & C trains.

2330 Entered 6 hr. LCO per T.S. i.C.I. 2nd LRED

^ initiated. Two LREDs became 259/83034 2350 Started shutdown of Units 2,3 + B0P Log (SE) 2 & 3, plant outside LCO per BF 12.14, TS 4.7.B.3.c.

(Requires completion of SI's on operable SBGT trains within 2 hrs. of a train becoming inop.)

(6/14/83) 2400 4.7.B-1 completed on (1) UO log A + C SBGT (B inop SI's)

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..](6/1/83)-(CONTINUED)-

0005 IP-2 B standby gas (1) SE Log treatment inop &

SI's not complete on'A+C trains within 2 hrs.

10010 IP-2 cancelled, A+C - (1) SE Log train SBGT operable 0105t 4.7.B-7 SBGT Flow i (1) UO Log rate test on "B" SBGT Train. Results called out to do A&C train but only did B train because A&C declared operable.

0245 4.7.B-7 completed for (1) UO Log "B" SBGT train,-flow Additional Comment:

set per SI @ 8458'CFM. It was observed that (via traverse). Flow the control. rm flow meters here are for meters disagreed w/the totalizing flow on all traverse.

3 trains.

0340 SI 4.7.B-2'"B" SBGT RH (1) UO Log Htr' controls off 0 0450 0430- See Comment .- .

SI 4.7.B-2 run - Rif (B-train) litt failed to operate as reg'd - Ck'd operation of

' relays and contactor for Ril picking up only momentarily. Ck'd flow against flow meters. Stan Solley noted (2-9-25 reading approx 17,000 cfm) b f

', 15/14/85) (CONTINUED) '

0600 Ck'd position of 0-65-503 SGT "B" SWS and 0-65-504 SGT "A". Visually in duct both dampers nearly closed.

0745 Discussed two LREDs w/ Gerald Paulk.

0800 Dwight Mims asked Roger McPherson to collect data & check damper positions on all SBGT trains.

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0810 Elect. cking "B" train (1) SE Log SGT. This work stopped when adjustment began on A&C.

0845 Ron Burns instructed IM's to check out flow transmitters.

0900 Dampers found to be considerably more closed that, they were when pitot measurements were made in May, 1983. This was discussed by BRM, DCM, Ril, JES and the decision was made to return A & C train dampers to their .- -

preset position and verify these positions with pitot traverses.

1015 Dampers on A & C SBGT trains returned to preset positions.

Preparations in progress for pitot traverse on both trains.

1120 Results section cking. (1) SE Log calibration on SGT flow meters. '0K'

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.-(6'[14[83) (CONTINUED) 1320 Started SI 4.2.A-13 (1) SE Log B-train SGT 1930 SI 4.7.B-1 (B SBCT (1) U0 Log func.) complete -

flow data from

4. 7. B-7 ' B ' t ra i n operable - ran Sl on A+C train to compare to SI 4.7.B-7 (6/15/83) 0100 SI 4.2.A-13 complete (1) UO Log

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