05000259/LER-1984-014, Updated LER 84-014-01:on 840222,reactor Scrammed When Turbine High Pressure First Stage Pressure Exceeded 142 Psig W/Turbine Stop Valves Closed.Caused by Procedural Error. Operating Instruction Revised

Updated LER 84-014-01:on 840222,reactor Scrammed When Turbine High Pressure First Stage Pressure Exceeded 142 Psig W/Turbine Stop Valves Closed.Caused by Procedural Error. Operating Instruction Revised

ML20087H995
Person / Time
Site:	Browns Ferry
Issue date:	03/13/1984
From:	Jones G, Rozear C TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
LER-84-014, LER-84-14, NUDOCS 8403220046
Download: ML20087H995 (3)

LER-2084-014, Updated LER 84-014-01:on 840222,reactor Scrammed When Turbine High Pressure First Stage Pressure Exceeded 142 Psig W/Turbine Stop Valves Closed.Caused by Procedural Error. Operating Instruction Revised

Event date:
Report date:
2592084014R00 - NRC Website

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C Form aos U S. NUCLEA*l S EEULATORY COMMtSSION 8

APf00VED OMe NO. 3150-010e LICENSEE EVENT REPORT (LER) i FACILITV NAasE 11) DOCKET NUMOER (2) FAGEdB Browns Ferry - Unit 1 o l s l o I o l o 1215 19 1lOFl0l2 TITLE len Unit 1 Scram From High High-Pressure Turbine First Stage Pressure EVENT DATE (5) LER NUMBER (S) REPORT DATE (71 OTHER F ACILITIES INVOLVED tel MONTM DAY YEAR YEAR *Ejj *

,L 7 MONTH DAY YEAR F ACILIT Y Fe AMES DOCKET NUMeERIS) 0 151010101 I l

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0l2 2l2 8 4 8l4 0l1l4 0 l1 0l 3 1l3 8l4 0 1 5 1 0 10 ici I l THIS REPORT IS SUSMITTED PUROUANT TO THE REQUIREMENTS OF to CFR 9 (Chece one er mere er in, ene.cas (113 OPS RATING "Oot *> N m 02ini m.0.<,, y .0 ne.H2HNi 73.7 uni POWER 30 4054eH1HO masteH1) 30.73(eH2Het 73.711el

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During startup of unit 1, while warming the turbine, the reactor scrammed when the turbine high-pressure first stage pressure exceeded 142 psig with the turbine stop valves closed. All redundant systems were operable. The cause of the scram is considered to be procedural error. The operating instruction will be reviced to keep the actual turbine first stage pressure from exceeding 135 psig during turbine stop valve closure.

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0l1 0l 2 oF 0 l2 rui re .,,, sa, . m .un, e wc m navown On February 22, 1984, with unit 1 operating at 7 percent power, unit 2 in startup cnd unit 3 in a refueling outage, the unit 1 reactor scrammed during startup when the turbine high-pressure first stage pressure exceeded 142 psig with the turbine stop valve (SHV) closed. The A2 and B1 reactor trip actuators were picked up and initiated the scram, indicating that only the setpoints of PT-1-81B and -91 A (turbine first stage pressure permissive) (JC) were reached, Subsequent review indicates that the turbfne first stage pressure permissive setpoint is reduced 12 psig for $nstrument accuracy and the actual setpoint is 142 psig vs.154 psig

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specified in the Technical Specifications.

The cause of this scram is considered to be procedural inadequacy. Operating instruction OI-47 will be revised to keep the actual turbine first stage pressure from exceeding 135 psis during turbine stop valve closure.

2 This scram was normal and'had no safety significance. There was r.o operation of the high preasure coolant injection system (BJ), the reactor core isolation cooling system (BH), main steam isolation valves (ISV) or main steam relief valves (RV),

Resconsible Plant Section - OP Previous Similar Events - None l

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+.) TENNESSEE VALLEY AUTHORITY l Browns Ferry Nuclear Plant .

P. O. Box 2000 Decatur, Alabama 35602

' March 16, 1984 i

l U. S. Nuclear Regulatory Commission

! Document Control Desk Washington, D. C. 20555

Dear Sir:

TENNESSEE VALLEY AUTHORITY - BROWNS FERRY NUCLEAR PLANT UNIT 1 - DOCKET

, NO. 50-259 - FACILITY OPERATING LICENSE DPR REPORTABLE OCCURRENCE REPORT BPRO-50-259/84014 R1 j The enclosed updated report has been made to correct typo on page 2 of 2.

' The numbers of setpoint PT-1-91A had been transposed. This report is j submitted in accordance with 10 CFR 50 73 (a)(2)(iv).

I Very truly yours, TENNESSEE VALLEY AUTHORITY

,.R %

. T. Jones Power Plant Superintendent Browns Ferry Nuclear Plant f

Enclosure oc (Enclosure):

Regional Administrator

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region II 101 Marietta Street, Suite 2900 Atlanta, GA 30303 j NRC Inspector, Browns lerry Nuclear Plant I

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