05000255/LER-1980-025-01, /01T-0:on 800801,during Vol Control Tank Venting, Unplanned Gaseous Release Occurred W/O 15-day Min Holdup. Caused by Either Dirt Trapped in Head Plate & Diaphragm or Uneven Tightening of Compressor Head Bolts

/01T-0:on 800801,during Vol Control Tank Venting, Unplanned Gaseous Release Occurred W/O 15-day Min Holdup. Caused by Either Dirt Trapped in Head Plate & Diaphragm or Uneven Tightening of Compressor Head Bolts

ML18045A503
Person / Time
Site:	Palisades
Issue date:	08/13/1980
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML18045A502	List: 05000255/LER-1980-025, Forwards LER 80-025/01T-0 05000255/LER-1980-025-01, /01T-0:on 800801,during Vol Control Tank Venting, Unplanned Gaseous Release Occurred W/O 15-day Min Holdup. Caused by Either Dirt Trapped in Head Plate & Diaphragm or Uneven Tightening of Compressor Head Bolts
References
LER-80-025-01T, LER-80-25-1T, NUDOCS 8008190477
Download: ML18045A503 (3)

LER-1980-025, /01T-0:on 800801,during Vol Control Tank Venting, Unplanned Gaseous Release Occurred W/O 15-day Min Holdup. Caused by Either Dirt Trapped in Head Plate & Diaphragm or Uneven Tightening of Compressor Head Bolts

Event date:
Report date:
2551980025R01 - NRC Website

text

NRC FORM366

. 17-ni LICENSEE EVENT REPORT CONTROL BL~I(: I 10 1

e (PLEASE PRll'/T OR TYPE ALL RECUiRED INFORMATION!

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75 REPORT CATE 80 EVENT DESCRIPTION ANQ PROBABLE CONSEQUENCES I DJ.iring volume control tank ve~ting, an unplanned gaseous release occurred

[]JI] !w[o the 15 day*minimum holdup required.by TS 3.9.17A; Actiyity.released

([I!] 1was approx 3.6 percent of limit of TS 3.9.11. Activity released (curies):

((TI] I I-131, 7*.71E-5; I-133, 8.31 E-5; I-135,.2.05 E-5; XE-l33, 7.06.* Release l))]JfOCcurred at waste gas compressor C-50A;.

Upon d;i.scovery, VCT venting was lIII] I stopped, i;i.nd affec~ed, plswt ru;ea (auxiliary bl d~) ws cl eared* of -personnel.I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS *

!Leak.age determined to be from compressor head. caused either by dirt ITIIJ I trapped between head* plate and* diaphragm or by nonuniform tightening of ITiiJ I compressor head bolts. *Diaphragm has been replaced.

A maintenmice pro-ITTIJ I cedure for this activity will be developed and will addi-ess head bolt OJ3] I torquing. diaphragm cleapl jpess.

• apd :QOst-roaintenance. J ee.k testin!i**

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RELEASED OF RELEASE AMOUNT OF ACTlVITY IT.El 1..QJ@ lHJ@l1.06 curies total 7

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10 11 PERSONNEL EXPOSURES

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11 12 13 80 PERSONNEL INJURIES

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. *-,.*.Attachment to LER 80-025,lT-O Consumers P~wer Company Palisades Plant Docket 50-255

• e EVENT DESCRIBTION At approximately 2200*on August 1, 1980, during venting of the volume control t~ (VCT) to the waste ga~ surge tank, ventilation.monitors a.lid the stack gas monitor annunciated.* VCT venting was halted, and trans:fer.of gas from the waste gas SlU'ge tank to the

• waste gas d~cay tank was also halted by stopping, waste gas *compressor C50-A.

Personnel were evacuated :from the ~uxiliary building.. Sa.mples

. were. taken and the. reiea_se _vi~ the stack w'as deterinined. to be. as. :follows:

• *rsotoEe* *

~

c{.cc Curries Qi/MPCi.

.I~31 1.09 E-9 7.71 E-5 9.56 E+9.

I-133 1.18 E-9 8.31 :m:,..5 7.21 E+7 I-135 2~90 E-10 2.05 E-5 7.12 E+5 Xe-133 4.37 E-4 7.06 E+O 8.17 E+9 TOTAL 7.06 E+O l.78 E+lO The.'. rel~ase was equivalent to 3. 6 percent of the average annual release rate limit spec;:if'ied by Technical Specification 3.9.11.. This occurrence is reportable per Technical Specif'ication 3.9.17a, vhich.requires gases collected by the *waste gas surge tank to be held up for a minimum decay Period of' 15 days prior *.to release *

CAUSE

DESCRIPTION AND CORRECTIVE ACTION.

Leakage was from the compressor head,.Via the seal between the liead and the diaphragm (ref'er to attached vendor drawing)~ Two possible causes have., been assessed: non-unif'orm.

t.ightening* d~ *the compressor head bolts which could. result in cocking of the COJ11,pressor*head, or dirt on the diaphragm-to-head* seating surface. All previous maintenance has been:- perfo~e*d by reference to the vendor's technical ma.Iiual (manuf'acturer: H. Corblin; Paris, France)

• The manual

• addresses cl.eanliness and uniform bolt tightening;* however, to provide p9sitive controls over maintenance activities related ~o waste gas compressors c:..50.A' and C.-50B a maintenance procedure will be developed.

The procedure will require., as a minimum,* proper head bolt torguing, verification of seating surface cleanliness, and a post-maintenance leakage.test.

- *'LOW ~-PRESS.URE

• 1 2

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• Attachment

. Consumers o LER.807'025/0lT-O er. Company Pal~sadesPlant - Docket 50~~55

.. DIAPHRAGM.COMPRESSOR.

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