ML20024C352

LER 83-028/03L-0:on 830602,stack Gas Radiation Monitors RM-90-147 & 148 Found Inoperable Due to Sample Pump Failure. Caused by Broken Glass Oil Filter Bowl on Sample Pump a & Mechanical Failure of Pump B.Bowl replaced.W/830630 Ltr

ML20024C352
Person / Time
Site:	Browns Ferry
Issue date:	06/30/1983
From:	Burton J, Green H TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-028-03L-03, LER-83-28-3L-3, NUDOCS 8307120544
Download: ML20024C352 (3)

Text

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l 0 l 0 l 0l 0l -l 0l 0!@l 4LICl 1l C E N . E NUM M E R 21 2. 1l 1l 1]@l ENSE T YPE _3. 5, l CAF S. l@ CON'T l0 l1 l ""u'#3 l L l@l 0 l 5 l 0l 0l 0l 2 l 5 l 9 l@l0 l6 EVENT l0 lD 2A TEl 8 l 3 l@l 0l6 lREPOR 3 lY 0D Al TE8 l 3 l@ y 3 .6 ., DO g,g g f MU MB E N .. .. ,4 75 .a EVENT DESCRIPTION AND PROGABLE CONSEQUENCES - -- [o l2 l l During normal operation of unit 3,O'o Doth stack gas radiation monitors (RM 90-147, l jojall RM 90-148) became inoperable due to sample pump failure. A grab sample program l j o l4 l [ for the stack effluent (SI 4.8.B.1.a.2) was initiated as required by l lo ls l l TS 3 8.B.8. There was no effect on public health and safety since the offgas l l 0 l 6 l [ ' post-treatment monitors (3-RM-90-265/266) were operable and grab sample analyses ! l0l7ll indicated no significant increase in activity. l 1018Il l DE CODE SUBC DE COMPONE NT CODE SUBCODE SUSC DE [oJ 9] lM lC l@ lE l@ l B l @ l P l Ul Ml PlX l X l @ l Gl@ l Zl@

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40 4, 4, 43 l Gl 0l 4l 6l 44 4, CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h [ilo ll The glass oil filter bowl on sample pump "A" was broken. The broken filter l ltlill bowl was replaced. Sample pump "B" failed when the Gast Mfg. (Model 2065-V2) l liI2ll rotary vacuum pump caused motor to trip out. A rebuilt pump was installed. The_j I i I 3 l l_. failure of pump "A" was a random occurrence. The_ failure _of pump _"B" is being l (tI4I( investigated _and_a_ followup _nepor.t_wil Lbe_ issued.

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                  ...uRI,""'s'lC. prion @                                                                                                                                 NRC WE ONW I 21                                                                       S O                9 I L.N.j@L._NA                                                                                        PM                                     l     l llllllIllll l NAME OF PREPARER                        James W. Burton. III                                              PHONE: 205/729-0621 t

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   ,    Ten n e.s.,ee Valley Authority                                              Form BF IT hrowns Ferry Nuclear Plant                                                     B F 15. 2 2/12/82 LER SUPPLEMENTAL INFORMATION i

BFRO 259 / 83028 Technical Specification Involved 3.8.B.8

                                                                                                 ~~

Reported Under Technical Specification 6 7 2.b. (2)

• Date Due NRC 07/01/83 Event Narrative:

Uiii~t' l was Tn a refueling outage, unit 2 was in a maintenance outage, and unit 3 was operating at 95-percent power. All three units had the possibility of being affected by this event. At approximately 2200 hours on June 2, 1983, both stack gas radiation monitors (RM-90-147/148) became inoperable due to failure of stack gas radiation sample pump " A ." The failure initiated a control room alarm. Plant operations personnel were immediately dispatched to place the redundant sample pump (pump "B") in service. A second control room alarm was received immediately after "B" sample pump was placed in service. Both "A" and "B" sample pumps were declared inoperable at this time. The radiochemical laboratory was instructed to initiate a grab sample and analysis program for the stack effluent (SI 4.8.B.1.a.2) as required by Technical Specification 3 8.B.8. The sample pumps and their associated radiation conitors (RM-90-147/148) were declared operable at 0317 hours on June 3, 1983 Technical Specification 3 8.B.8 requires that a minimum of one stack gas radiation monitor be operable when any unit's steam jet air ejector,

echanical vacuum pump, or a standby gas treatment train is in service. This requirement was not met for approximately 5 hours and 17 minutes.

This event was caused by the failure of sample pumps "A" and "B ." Sample pump "A" failed due to loss of oil (broken filter oil bowl) and sample pump "B" failed when the motor tripped out. It is believed that mechanical failure of pump "B" caused the motor to trip. The failure of pump "A" was a random occurrence. The failure of pump "B" is being investigated and a followup report will be issued upon completion of the investigation. This event had no adverse effect on the health or safety of the public. No significant increase in activity levels was detected by analysis of the stact: gas grab samples. Additionally, a review of SI 4.8.B.1.a.1 (Airborne Effluent Log) revealed no significant increase in activity during this time, e Previous Similar Events: None l l Retention : feriod - Lifetime; Responsibility - Document Control Supervisor

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TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. TENNESSEE 37401 OJ t> g 1750 Chestnut Street Tower II kg

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co 7 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-50-259/83028 The enclosed report provides details concerning the failure of the stack gas radiation monitors because of pump problems. This report is submitted in accordance with Browns Ferry unit 1 Technical Specification 6.7.2.b(2). Very truly yours, TENNESSEE VALLEY AUTHORITY y //t/' /h! p H. J. Green Director of Nuclear Power Enclosure oc (Enclosure): Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Records Center Institute of Nuclear Power Operations Suite 1500 1100 Circle 75 Parkway Atlanta, Georgia 30339 NRC Inspector, Browns Ferry OFFICIAL COPY . An Equal Opportunity Employer t g

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