ML19283B779

Forwards 1978 Refueling Outage Type B and Type C Local Leak Rate Test Summary & 1978 Refueling Outage Type B & C Tests Which Failed to Meet Acceptance Requirements.

ML19283B779
Person / Time
Site:	Fort Calhoun
Issue date:	03/12/1979
From:	Short T OMAHA PUBLIC POWER DISTRICT
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 7903190325
Download: ML19283B779 (13)

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Omaha Public Power District 1623 HARNEY a OMAHA, NEORASKA 60102 m TELEPHONE 530-4000 AREA CODE 407 March 12, 1979 Director of Iluelcar Reactor Regulation

U. S. Uuelear Regulatory Commission

, ,! Wachington , D. C. 20555

, Attention: Distribution Services Branch, DDC, ADM Re ference : Docket No. 50-285 Gentlemen:

In accordance with Fort Calhoun Station Technical Specification 5 3.5 and 10 CFR 50, Appendix J, please find enclosed twelve (12) copies of two (2) reports entitled "1978 Refueling Outage Type B and Type C Local Irak Rate Test Su rary" cnd "1978 Refueling Outace Type B and C Tests Which Failed to Meet the Acceptance Requirements".

Sincerely, l{lh.fShort 1

,3 T. F/.f20

[ Ascistant General l'anager TES/KJM/B.JH: j mm Enclosures cc: LeBoeuf, Lamb, Leiby & MacRae 1757 "N" Street, U. W.

Washington , D. C. 20036 79031903d6

1978 Refueling Outace Type B and Type C Local Leak Rate Test Sw=ary As part of the 1978 refueling outage, local tests were performed on the reactor containment bui.lding penetrations in accordance with Foit Calhoun Station Technical Specifications section 3.5 and 10CFR50, Appendix J. The testing is done to identify, measure, and, if required, initiate maintenance on potential reactor containment leakage paths, and to ensure that this total leakage does not exceed the Technical Specification limit of 0.6 La (Leakage Allowable), 62,951 seem (standard cubic centimeters per minute). The final local leakage as measured from all local leakages was kl,895 scem. The lenk-ages are tabulated on the attached Tables 1 through 5 The Type B Tests were conducted by pressurizing the 20 cal contain: rent penetration boundaries with air or nitrogen (for electrical penetrations) to Pa, 60 psig accident pressure, and measuring the flow rate which is required to maintain the test volume at Pa. This flow rate is assumed to be the local containment leak rate. The leak rate measurement system uses a series of cali-brated rotameters to determine the leakage.

The Type B Tests are conducted to r easure the leakage through the con-tainment mechanical and electrical penetration seals, and containment build-ing resilient scaled penetrations. The tests are conducted as part of the Fort Calhoun Stui, ion Surveillance Testing Progran.

The Fuel Transfer Tube Leak Rate Test (ST-COUT-2 F.h ) was conducted on October 24, 1978, and November 29, 1978. The measured leakane is tabulated on Table 1.

The electrical penetration leakage was checked as per ST-CONT-2 F.5 using nitrogen as the pressure media; no leakage was measured (see Table 2).

The mechanical penetration s]eaving was leak tested in accordance with ST-COUT-2 F.2. The leakages are tabulated on Table 3 The equipment hatch was tested (ST-CONT-2 F.3) prior to its initial removal and following each replacement; the results are tabulated in the at-tached Table h.

The personnel access hatch was tested in accorda1.ce with ST-CONT-2 F.1, the reduced pressure test; daily test results are on file at the Fort Calhoun Station. The Personnel Air Lock (P.A.L.) was also leak tested twice (every six months ) per ST-COUT-2 F.2. The leakage is taburited belev:

Date Tested Icakare J an . 27, 1978 5100 cc June 17,1978 35 cc The Type C Tests ST-CONT-3 F.1, F.2, and F. 3 were perfor :.ed to neasure the leakage of the containment isolation valves. The tests are conducted using air as the test meditun (with the exception of' 'i-16 shutdown cooling, M-91 4 and 11-95 main steam, and M-91 and !!-97 auxiliary feedwater) .

Maintenance vac required on four mechanical penetrations (M-93, M-95, M-383-3, M-383-4) and on the valves associated with penetrations 'i-lo, "-13, M 47, M-58, M-87, M-88, M-91, an d M-97 The work done on these penetrations and valves is described in the accompanying report.

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TABLE 1 TYPE B TEST Fuel Tranarer Tube Leak Rate Test DATE PFRFOB:ED LEAKAGE 10/2h/78 0 seem 1600 seem 11/29/T8

TABLE 2 TYPE B TEST Electrical Penetration Leak Rate Test PE!IETRATT0!i LEAL"JtGE A-1 0 A-2 0 A14 0 A-5 0 A-6 0 A-7 0 A-8 0 A-9 0 A-10 0 A-11 0 B-1 0 E-2 0 B It 0 B-5 0 E-6 0 B-T 0 B-8 0 B-9 0 B-10 0 E-11 0 C-1 0 C-2 0 C It 0 C-5 0 C-6 c C-7 0 C-8 0 Co O C-10 0 C-ll 0 D-1 0 D-2 0 D14 0 D-5 0 D-6 0 D-7 0 D-8 0 D-9 0 D-10 0 D-ll O E-1 0 E-2 0 E14 0 E-5 0 E-6 0 E-7 0 E-8 0 E-9 0

TABLE 2 (Continued)

PENETRATI0'I LEAKAGE E-10 0 E-11 0 F-1 0 F-2 0 F-4 0 F-5 0 F-6 0 F-7 0 F-8 0 F-9 0 F-10 0 F-11 0 G-1 0 G-2 0 G-3 0 G-4 0 H-1 0 H-2 0 H-3 0 H-h 0 M-383-3A 0 M-383-3B 0 M-383-hA 0 M-383 hB o

S TABLE 3 TYPE B TECT Mechanical Penetration Seals PEI!ETRATIO:I IIIITIAL LEAKAGF LEAKAGE AF7PR MAI'IT.

M-1 0 -

M-2 0 -

M-3 0 -

MIt 0 -

M-5 0 -

M-6 0 -

M-7 0 -

M-8 0 -

M-9 0 -

M-10 0 -

M-11 0 -

M-12 0 -

M-13 0 -

M-ll4 0 -

M-15 0 -

M-16 0 -

M-17 0 -

M-18 0 -

M-19 0 -

M-20 0 -

M-21 0 -

M-22 0 -

M-23 0 -

M-214 0 -

M-25 0 -

M-26 0 -

M-27 0 -

M-28 0 -

M-29 0 -

M-30 0 -

M-31 0 -

M-32 0 -

N-33 0 -

M-3}i 0 -

M-35 0 -

M-36 0 -

M-37 0 -

M-38 0 -

M-39 0 -

M 104 0 -

M Ill 0 -

M 124 0 -

M163 0 -

M 14It 0 -

M l+ 5 0 -

TABLE 3 (Continued)

PENETRATION INITIAL LEAKAGE LEATJiGE AFTD1 MAII'T.

M-h6 0 -

M-h7 0 -

M h8 9 6 seen 9.6 seen M-h9 0 -

M-50 0 -

M-51 0 -

M-52 35 5 seem 35 5 seem M-53 0 -

M-Sh 0 -

M-55 0 -

M-56 0 -

M-57 0 -

M-58 0 -

M-59 0 -

M-60 0 -

M-61 0 -

M-62 0 -

M-63 0 -

M-6h 0 -

M-65 0 -

M-66 0 -

M-67 0 -

M-68 0 -

M-69 0 -

M-70 0 -

M-71 0 -

M-72 0 -

M-73 0 -

M-Th 0 -

M 'T 5 0 -

M-76 0 -

M-77 0 -

M-78 0 -

M-79 0 -

M-80 0 -

M-81 0 -

M-82 0 -

M-83 M-Sh o -

M-85 14.h seem lb.h ceca M-86 0 -

M-87 0 -

M-88 0 -

M-89 0 -

M-90 0 -

M-91 0 -

M-92 0 -

M-93 260 neem o seem M-9h bl00 cecm bl00 neen M-95 92,031 ocen 16,000 ocen

TABLE 3 (Continued)

PEI1ETRATIOTI IIIITTAL LEAKAGE IP.AVJtGE API r.N f TAT!!T.

!!-96 0 -

M-97 0 -

M-98 0 -

M-99 0 -

M-383-3 14,159 seen 5,000 seem M-383-h 1,500 seem 1,500 ccen i

TABLE Is TYPE B TEST Equipment IIatch "O" Ring Seal Test DATE LFMAGE 10-11-78 0 5 seem 10-30-78 18 seen 11-17-78 7.h seem 12-5-78 0 seem 12-8-78 11.7 seem

TABLE 5 TYPE C TEST Containment Isolation Valve Leak Rate Test PE!!ETRATIO?I INITIAL LEAKAGE LEAKAGP AFTER ATi!T.

M-2 0 -

M-7 0.6 ocen 0.6 seen M-8 0 -

• • M-9 0 -

M-10 3800 seen 170 seen M-11/15 0 -

• • M-12 0 -

M-13 188,330 seen o seem M-ll4 700 scen 700 seen M-16 18.5 ccen 18.5 seen M-18 0 -

M-19 0 -

M-20 0 -

M-22 0 -

M-216 0 -

M-25 0 -

M-30 0 -

M-38 10 seen 10 seen M-39/53 0 -

M 124 1150 seen 1150 seen

" 143 0 -

M-h5 20 seen 20 seen M l+ 6 215 seen 215 seen M-h7 28,h]2 seen 97 seen M-h8 557 seen 557 seen M-49 0 -

M-50 230 seen 230 seen M-51 171 seen 170 seen M-52 6.6 seen 6.6 seen M-57 lb.6 seen 1h.6 seen M-58 500 seen 19 seen M-63 0 -

M-69 0 -

M-73 0 0 seen M-Th 1300 seen 1300 seen M-79 0 -

M-80 0 -

M-86 0 -

M-87 35,397 seen 3500 seen M-88 107,606 seen 3500 seen M-89 0 seem -

• • M-91 3000 ccen 500 scen M-9? h60 seen h60 seen

• • M-9h' 150 ccen 150 seen

• " M-95 h000 seen h000 seen M-96 h60 seen h60 seen

• • M-97 172,735 seen 9.53 seen M-383-3 0 -

M-383-h 0 -

• • Heed not be added to the .6Lu linit per Technien1 Gpecification 3.5

1978 Refueling Outage Type B and C Tests Which Failed to Meet the Acceptance Requirenents Type B and C Testu which failed to nect the acceptance criteria anl the adjustnents or repairs made to these are reported below.

The mechanical penetration sleeving was leak tested in accordance with ST-C0"T-2 F.2. During the performance of this test, one main stcan pene-tration van found to be leaking (M-95 leakage was 92,031 soc / min.). Further investigation showed the leakage on the penetration was on the outer bellows assembly only. A sealer was applied to the outer bellows seal and a fire proof boot installed which resulted in a reduction of leakage to 16,990 sec/nin. on M-95 The leakages are tabulated on Table 3 Maintenance was perforned on M-93 (Feedwater) consisting of welding over a small pinhole leak which reduced the initial leakage of 260 ccen to zero.

Maintenance was also required on the Recirculation Penetration M-F:V-383-3 sleeving. The sleeve nanways bolts were found to have damaged washers. The washers were replaced and the leakage reduced (M-383-3 lh,159 seen to 500^ neen).

Maintenance was required on the valves of six penetrationn. Penetration M-58 valves were cycled to verify proper closure. The leakage prior to cycling was 500 scen; the leakage following cycling was 800 seen. The valve was rebuilt and leakage was reduced to 19 seen.

RC-2A and RC-23 blowdown penetrations M-10 and M-13 required a rebui2 ding and repacking of the valves. The leakage was reduced from 3S00 seen to 170 ccen for M-10 and fron 188,310 seen to zero leakage on M-13.

The containment purge supply and exhaust penetrations M-88 and M 87 leakages were found to be in execcc of the Technical Specification limit, (leakages were 107,606 seen on M-88 and 35,397 ucen on M-87). This

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execccive leakage was reported on Licencee Event Report 50-285/78-Oh0.

The valve's coals and packing were replaced. The penetration retent showed 3500 ccen leakage for both M-87 and M-88. Since M-87 and M-88 were '<>ted on September 14, 1978 and the leakage was found to be 8,h10 seen, it can be concluded that prior to the refueling outage the leakage through these valves did not exceed the 0.6 L limit, and that during plant operation a

containment integrity vac not violated through the containnent purge valves.

The Auxiliary Feedwater (to stean generatora) Penetrations were also repaired with a reduction in leakage fron 3000 seen to 500 seen for M-91 and from 172,735 cecm to 9 53 seen for M-97 It should be noted that these penetrations are not accountable under the 0.6 L leakage linit.

The containnent atmospheric sample penetration M h7 required a diaphragn replacenent which reduced the leakage frcn 28,hl2 seen to 96 seen.

A tabulation of all leakages in given in Table 5