GO2-83-115, Final Part 21 Rept on Condition 295 Re Standby Gas Treatment Unit Charcoal Filter Bed Leakage.Initially Reported on 831115.Gaps Between Frame & Perforated Plates Sealed W/Ge Sealant 727

Final Part 21 Rept on Condition 295 Re Standby Gas Treatment Unit Charcoal Filter Bed Leakage.Initially Reported on 831115.Gaps Between Frame & Perforated Plates Sealed W/Ge Sealant 727

ML20083F034
Person / Time
Site:	Columbia
Issue date:	12/13/1983
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
REF-PT21-84-132-000 10CFR-50.55E, 295, GO2-83-1152, PT21-84-132, PT21-84-132-000, NUDOCS 8312300108
Download: ML20083F034 (3)

Text

-

.f;ECBVfD tL "

Washington Public Power Supply System.

P.O. Box 968 3000 GeorgeWashingtonWay Richland, Washington 99352 (509)372-5000 1333 DEC I6 oli12: 29 December 13, 1983 G02-83-ll52 REGIO!J V12I Mr. J. B. Martin Regional Administrator U. S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596

Subject:

NUCLEAR PROJECT N0. 2 10CFR50.55(e) REPORTABLE C0:4DITION #295 STANDBY GAS TREATMENT UNIT CHARC0AL FILTER BED LEAKAGE

Reference:

Telecon dated November 15, 1983, R.T. Johnscn to B. Dodds.

In accordance with the provisions of 10CFR50.55(e), your office was informed by the reference, of the above subject condition. The attachment provides the Project's final report on Condition #295.

If there are any questions concerning this matter, please contact Roger Johnson, Project QA Manager, WNP-2, at (509) 377-2501, extension 2712.

( .

-w G. C. Sorensen Manager, Regulatory Programs RTJ/kd

Attachment:

As stated cc: W.S. Chin, BPA N.D. Lewis, EFSEC A. Toth, NRC Resident Inspector Document Control Desk, NRC 8312300108 831213 PDR ADOCK 05000397 S PDR 3E p

p_ -

WASHINGTON PUBLIC POWER SUPPLY SYSTEM NUCLEAR. PROJECT N0. 2 DOCKET N0. 50-397 LICENSE N0. CPPR-93 10CFR50.55(e) CONDITION 295 STANDBY GAS TREATi1ENT SYSTEM LEAXAGE OF CHARC0AL FILTER BED LEAKAGE FINAL REPORT Description of the Deficiency Operational testing of the Standby Gas Treataent (SGT) unit caused the activated charcoal in the filter beds to leak out into the downstream filter compartaent.

The perforated plates which create the container for the activated charcoal in the unit were determined to be warped, apparently by the spot welding of

. the perforated material to the structural frame of the filter section. These warped areas vary in size arouno the perimeter of the filter frames on ootn filter trains being most significant on unit SGT-CF-132.

Safety Significance The.SGT systea is a safety-related system to collect and process the. leakage of radioactivity from the primary containment and to enable purging of the primary containaent when radiation levels within the containment are too high to permit purging through the reactor building exhaust system. The SGT systea has redundant filter trains and control configuration to provide maxiaca relia-bility to control plant discharges to the environment. The loss of activated charcoal filter media, had it not been identified, could have resulted in a coamon mode failure of both filter trains when required to mitigate the affects of a loss of coolant accident. The condition is considered to be reportable under tha criteria of 10CFR50.55(e) and Part 21.

Corrective Action Engineering direction has been issued by the Supply System to eliainate the leakage of the charcoal from the filter. ilaterial has been fitted into the gap areas between the frame and the perforated plates created by the warpage and riveted in place. Very small gaps have been sealed with GE Sealant ilo.

727 (Reference S215-116137).

The corrective action has been implemented, as required, and the filters are scheduled to be retested during the week of December 2, 1984.

Action to Prevent Recurrence Startup testing remains the principal tool for identifying equipment operational probleas of this nature.

The' units were acquired frou the Farr Coapany of Los Angeles and their shop inspection and testing were the appropriate neans to have prevented the defi-ciency. Farr Company has been contactea by tne Supply System Procurement Qual-

, ity Assurance Departaent to ascertain their corrective action. Farr has been instructed to review this item for reportability under 10CFR21.

1 I

, 7--_ . _ _, ._m , . - . . , . . _

m -__ ._ ,, . _ _ _ , _ _ . _ . _ _ , , _ _ _ _ . . . ., . _ . - _ _ _ .

g y_m. .....,...~.--._; - - - - -

---g----- . .. , ;y 06 9 7 9-V

~

4 l' l "" "

moisTurs.e scenenroe oetr> UED CARBOM PILTEES _

u zo , + eEcao. +- Tnicx. '

uoTeo. .

-fAAIN HEATER, 47.o l. CASING DESIGH PRESSURE -15 IMS.WG

2. cs 22.5 EW G.A. ro -+ 2.0 P SI .

r 2.CLEAM FILTER T1ESISTANCE.

e 4,000 crea is s.s ins. we.

_ jO__

~

e

,94.o t {. (7 g,g.;

Ale {!_ __i' gy ]b _.p ;. .__,eq ___

i; i_l . _ . _ _ _ _ . -

3. M AX CA$ LNG LE AK RATE 15 0.01 [.

rtoJ 5; F if N Al Nj rd N

ly A_j N o of' RAT ED FLOW AT l o lM S. WG.

N N 4. MATL: 11 G A (.120) cotD ROLLED N +- STEEL PER A STt4 - A-3 6G. .

(.. O -

_ . _ 5. f INI S H ; S AMD bt AST PER SSPC-SPG

~ 22.0 REC.OMMENDED PRIME WITH 4.6 MILS KEELCR 4 LCMG 'll 07 ,

FOR FILTER SERVICE FIMI5 H WITH 2.5 MILS KEELER (LONG 1415' ~

6. GROO P l AS SH OWN TAG Mo. %T-FU-1 A 3

^

[5 7* ,g G Ro0 P 2 O P Po s tTE TAG 3 N?. GGT-FU-1B-4 HEPA FILTER "k HEPA FILTER xil 2, RE@ ~

24v 24 x it '/a.,4 REQD HblOO foO. O RECOMMEMDED- _

. po 7 FILTER SERVICE PRE-PILTER 2.4 y '2 4 v 8, 4 R EQ b '

g ,9 sg p . ,F,

~ ] _ r_ g ,,,,,,,,t.,

18 150 LB FLANGE BOTH EMD S = w' cmr'e w. e *' o- "' cz en m

_._ 8 l

_[

._._,' _.__ e~,.......-."*' DO f40T SCALE FR!flT

.__l ___ l _

pg

; , i ,

~ '

5 Z *//.L. l = =-

' ' I (6 '-2") k, bfkkkkk','.. * *""' = a ~a I ' _.-- _j_ ruccoec -

d \oli I - l - l - -

o' pro o- - o-- qi c. , o O-a rucc otewAt. ~~~'a=

l o o io- O c *"% ~ < -

_n 0

@ spur .$ setir I. m.o a ruct orc ~^'a

-A l-o v-c2 2 c 4

$sruT rm r.o~.t . aucut.. .

l --

j -

3; ANDBY G AS TREATMENT SYST.

-45.o aox Go Access Door l,

'l 8REQD H AN FORD MO. 2 ~

L WMillMGTON PUBUC POWER SUPPLY SYST.

I 4

i

@)e"".S."5'f.",!

A-5^i"II50 Ih 1

4 L- -

~

-M==*-

P

_ s , A