ML20045H256

LER 93-010-00:on 930611,1 of 14 Halon Cylinders Did Not Meet Min Pressure Acceptance Criteria Listed in Semiannual Switchgear Rooms Surveillance Test.Caused by Failure of Test to Include Necessary Steps.Cylinder recharged.W/930712 Ltr

ML20045H256
Person / Time
Site:	Fort Calhoun
Issue date:	07/12/1993
From:	Boston K, Gates W OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-93-010, LER-93-10, LIC-93-0175, LIC-93-175, NUDOCS 9307200021
Download: ML20045H256 (5)

Text

- - - .

i Omaha Public Power District P.O. Box 399 livy.75 Northof Pt.Calhoun Fort Calhoun. NE 68023-0399 402/636-2000 ,

l l

July 12, 1993 l LIC-93-0175 '

1 U. S. Nuclear Regulatory Commission  ;

Attn: Document Control Desk  !

Mail Station P1-137 Washington, DC 20555

Reference:

Docket No. 50-285 Gentlemen:

Subject:

Licensee Event Report 93-010 for the Fort Calhoun Station Please find attached Licensee Event Report 93-010 dated July 12, 1993. This ,

report is being submitted pursuant to 10 CFR 50.73(a)(2)(i)(B). If you should '

have any questions, please contact.me.

Sincerely,

$V. N.

W. G. Gates Vice President WGG/jrg Attachment c: J. L. Milhoan, NRC Regional Administrator, Region IV S. D. Bloom, NRC Project Manager R. P. Mullikin, NRC Senior Resident Inspector INPO Records Center l

150006 ,

I l

4s sm 9307200021 930712 PDR ADOCK 05000285 f5

,y 2 l-g PDR w (,

L_

l NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROtfED BY OMB NO. 3150 olo4 e o2) EXPlRES 5/31/95 ESTIMATED BURDEN PER RESPONSE TO COMPLY WITH THIS I LICENSEE EVENT REPORT (LER) g h*gNURD% $ ATE O IN R g  ;

AND RECORDS MANAGEMENT BRANCH (MNB0 7714), U.S. NUCLEAR REGULATORY COMMISSION. WASHINGTON, DC 20555 0001, AND TO (See reverse for required number of digits / characters for each block) ME D UDG WAS G ON, FAOLITY MME (1) DOCKET NUMBER p) PAGE p)

Fort Calhoun Station Unit No. 1 05000285 1 OF 4 Tms m Failure to Address Low Halon Tank Pressure Following Surveillance Test EVENT DATE (5) LER NUMBER (6) REPORT NUMBER (7) OTHER FACIUTIES INVOLVED (8)

MONTH DAY YEAR YEAR MONTH DAY YEAR NUMBER NUMBER 05000 F ACluTY NAME DOCKET NUMBER 06 11 93 93 --

010 --

00 07 12 93 05000 OPERATING THIS REPORT IS SUBMITTED PURSUANT TO THE REOUIREMENTS OF 10 CFR s: (Check one or more) (11)

MODE (9)

I 20.402(b) 20.405(c) 50.73(a)(2)(lv) 73.71(b)

POWER 2 A 5 anu m er ny m7 (ax2xo 73.7m 100 20.405(a)(1)(ii) 50.36(c)(2) 50.73(a)(2)(vii) OTHER LEVEL (10)

X 50.73(a)(2)(viii)(A) (SpecRyin Abstract 20.405(a)(1)(lii) 50.73(a)(2)(i) 20.405(a)(1)(iv) 50.73fa)(2)(ii) 50.73(a)(2)(vill)(B) p[N) 20.405(a)(1)(v) 50.73(a)(2)(iii) 50.73(a)(2)(x)

UCENSEE CONTACT FOR THIS ER (12)

NAME TELEPHONE NUMBER pnclude Area Code)

Kevin R. Boston, Shift Technical Advisor _(402)533-6477 COMPLETE ONE UNE FOR EACH COMPONENT FAIL 1JRE DESCRIBED IN THIS REPORT (13)

CAUSE SYSTEM COMPONENT MANUFACTURER T N RDS CAUSE SYSTEM COMPONENT MANUFACTURER RS M NTH DAY YEAR SUPPLEMENTAL REPORT EXPECTED (14) EXPECTED yt3 SUBMISSION or yeo, complete EXPECTED SUDM SSION DATE) X W DATE (15) fBSTRACT (Umit to 1400 spaces, l.a., approximately 15 single 4 paced typewritten lines) (16)

On June 11, 1993, during performance of Surveillance Test GM-ST-FP-0005, " Semi-Annual Switchgear Rooms Halon Cylinders Weight and Pressure Test", one of the 14 Halon cylinders did not meet the minimum pressure acceptance criteria listed in the procedure.

This unacceptable pressure value was not noticed during performance of the test. After the surveillance test was completed, the Switchgear Rooms Halon system was returned to service. The unacceptable pressure value was identified during the post-performance 14, 1993. This report is being review of the submitted test bytothe pursuant 10System CFR 50.73(a Eng)ineer on June (2)(i)(B) due to the failure to satisfy Technical Specification 2.19(8)betweenJune 11, 1993 and June 14, 1993.

The causes of the event were determined to be the failure of the surveillance test to include the necessary steps to assign responsibility for verification of data for acceptability and failure to self-check / verify. ,

The Halon cylinder was recharged and retested on June 14, 1993. Additional corrective actions will include revising specified procedures to clarify responsibilities.

1 i

NRC FORM 306 p 92)

NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB NO. 91504104 po2) EXPIRES 5/31/95 ESilMATED BURDEN PER RESPONSE TO COMPLY WITH THIS LICENSEE EVENT REPORT (LER) '"sTMggadouE,sg c gggg TEXT CONTINUATION gRE S MA ME B W DM ) N E

'"M=%"Eh""A sTo%.s=' "" "

M FACILffY NAME (1) DOCKET NUMBER R LER NUMDER M PAGE M SEQUENTIAL HEVISION NUMBER NUMBER Fort Calhoun Station Unit No. 1 05000285 93 --

010 -- 00 11nt pt more space is reqwred, use addinonal copies of NHC Form 3eSA) (17)

BACKGROUND Fort Calhran Station (FCS) Technical Specification (TS) 2.19(8) requires the Control Room, Switchgear Rooms and Cable Spreading Room Halon storage tanks to have at least 90%

of full charge pressure and 95% of full charge weight or level. To demonstrate operability, TS 3.15(8) requires verification of each Halon storage tank pressure and weight or level at least once every 6 months. If the Halon system is determined to be inoperable, a continuous fire watch with backup fire suppression equipment is to be established.

EVENT DESCRIPTION On June 11, 1993, with FCS at 100% power (Mode 1), Surveillance Test GM-ST-FP-0005,

" Semi-Annual Switchgear Rooms Halon Cylinders Weight and Pressure Test," was to be performed to verify operability of the Switchgear Rooms Halon system. This procedure directs the initiation of a Fire Protection Impairment Permit (FPIP) for the Switchgear Rooms prior to its performance. The FPlP for the Switchgear Rooms requires a continuous fire watch.

For each Halon cylinder, GM-ST-FP-0005 requires that the Halon cylinder be disconnected, placed on a scale to determine its weight, a surface thermometer applied to measure the cylinder temperature, the cylinder pressure read from an installed gauge, and the cylinder reinstalled. The data collected is recorded on data sheets within the rocedure.

p(QC) person is required to obtain the test data for each tank.A Thecraftsperson procedure requiresremoves and reconnects that all anomalies and deficiencies identified during the test be reported to the immediate supervisor and Shift Supervisor, and noted on the comment sheet for the test.

The minimum acceptable weight for each cylinder is listed on the cylinder's data sheet.

l The cylinder temperature reading is recorded and used to determine the minimum acceptable cylinder pressures by using a temperature vs. pressure correction table within the procedure. This minimum acceptable pressure is recorded on the data sheet immediately below the recorded tank pressm ? value read from the installed gauge. The QC person is required to initial the data entries for cylinder weight, cylinder temperature and pressure, and minimum acceptable cylinder pressure.

The data recorded for Halon Storage Tank 07565EH indicated that the tank exceeded the minimum weight requirement but was below the minimum pressure specified for the measured cylinder temperature. The QC person collected the test data and signed off the data sheet steps. The unacceptable pressure test value was not identified by either the craftsperson or the QC person. Accordingly, no notifications were made, nor were comments noting the deficiency entered into the test.

Nnc rOnu seeA wo2) 8

NRC FORM 366A U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB NO. 315o4104

&Ba EXPIRES 5/31/95

- O CTON E R LICENSEE EVENT REPORT (LER) "

TEXT CONTINUATION NECNs MANAG MENT VC BB U S?NI RE PF E (3 50- FICE OF MANAGEMENT AND BUDGET, WASHINGTON,DC 20503.

FACILITY NAME (1) DOCXET NUMBDI R LER NUMBER M PAGE R g SEQUENTIAL HEVISION NUMBER NUMBER Fort Calhoun Station Unit No. 1 05000285 3OF4  ;

93 --

010 -- 00 '

uxre, .o.u...ooit,on.i.o,..o,NeiCFc.m3.e43cir;

. - i.,

l l

1 Following the testing of the rest of the Halon tanks for the Switchgear Rooms, Control )

Room Operators were directed by the procedure to return the Halon disconnect switch to 1 the normal position, with OC to witness the reactivation. The Shift Supervisor was then notified that testing was complete, and signed the procedure step reflecting this notification. The Halon system was returned to service on June 11, 1993 at 1459, the l FPIP was closed out, and TS 2.19(8) was cleared. The test was signed-off as complete by 1 the craftsperson and forwarded to the Craft Supervisor for review. 1 The Surveillance Test Coversheet indicates that the Craft Supervisor's review is to address whether the test results are acceptable and, if applicable, whether the test results satisfy Technical Specifications. The Craft Supervisor reviewed the test data sheets but did not notice the unacceptable results. The Craft Supervisor subsequently signed the Surveillance Test Coversheet, indicating acceptable test results.

The post-performance review of the test by the System Engineer identified the cylinder pressure deficiency on June 14, 1993 at 1202, and the Shift Supervisor was notified.

Technical Specification 2.19(8) was entered and a Fire Protection Impairment Permit was initiated. A continuous fire watch was established on June 14, 1993 at 1235.

A Maintenance Work Order (MWO) was initiated to recharge and retest the Halon tank.

Following completion of the MWO the FPIP was closed out, TS 2.19(8) cleared and the .

system declared operable on June 14, 1993 at 1858. l This report is being submitted pursuant to 10 CFR 50.73(a)(2)(i)(B) due to the failure to satisfy TS 2.19(8) between June 11, 1993 and June 14, 1993.

SAFETY ASSESSMENT The effect of this event on nuclear safety was negligible. None of the 14 Halon cylinders for the Switchgear Rooms was found to be below minimum acceptable weight.

(Cylinders contain Halon and nitrogen. Meeting minimum acceptable weight ensures sufficient Halon is available.) Only one of the 14 Halon cylinders was below its minimum acceptable pressure. The pressure recorded for storage tank #77565EH was 360 psig, while its minimum acceptable pressure was recorded as 386 psig. Although this pressure did not meet the established acceptance criteria for the recorded tem)erature, a pressure as low as approximately 200 psig is sufficient to fully discharge t1e contents of the cylinder. The event did not affect the operability of the Switchgear Rooms fire detection system. In the event of a fire, the Control Room would have been alerted to the situation by the fire detection system and the fire brigade could have  ;

been dispatched to provide additional fire suppression.  ;

i i

NRC FORM 3GBA (5-D4 l

.. _ _ - . ~ . . -- , .. . ~ - - . . . = = - - - _ . .

NRC FORM 306A U.S. NUCLEAR RE2ULATORY COMMIS810N APPROVED BY OMB NO. 31504104 4 82i EXPIRES 5/31/95 -

ESTIMATED DURDEN pea FESPONSE TO COMPLY WITH THIS ON U 50 "

UCENSEE EVENT REPORT (LER) g,%LCOLLE BU c 0T INF

" ""A" ^"a2 R J'C#3s"'w=Tr=",APA."=

Fw /o N 7 E Eo" E As E EN.E *,o E D " " ' "

FACRJW NAME p) 00CEET NUMBER R LER NUMBER R PAGE R BEQUENTIAL REVISION p YEAR NUMBER NUMBER Fort Calhoun Station Unit No. 1 05000285 '

4OF4 93 -- 010 -- 00  ;

Text a mo,. . ,.w.a. u .oa,iion.i .oPi ., Nrc ro,. aosA: p73 ,

I CONCLUSIONS l

A Root Cause Analysis (RCA) was performed following the identification of the failure =to address the unacceptable Halon storage tank pressure. The causes of the event were  :

determined to be the failure of the surveillance test to include the necessary steps to assign responsibility for verification of data for acceptability and failure to self-check / verify. The procedure was found not to be in accordance with the procedure- ,

writers guide with respect to verification of data acceptability.-

CORRECTIVE ACTIONS r

As previously noted, the Halon cylinder was recharged and retested on June 14, 1993.

The following additional corrective actions have been or will be completed:

1.- Appropriate disciplinary action was taken.  ;

2. Procedure GM-ST-FP-0005 and two similar procedures, GM-ST-FP-0003 and GM-ST-FP-0004, will be revised to clarify responsibilities by ,

November 8, 1993. The next scheduled performance of these tests is December '

1993.

3. A sample of other surveillance tests performed by Crafts will be reviewed by ,

September 15, 1993 to determine whether review of data for acceptability is-adequately addressed prior to test completion. ,

4. Management expectations for proper evaluation of test results will be emphasized to personnel responsible for surveillance testing by ,

September 1, 1993. ,

PREVIOUS SIMILAR EVENTS LER 92-021 discusses a previous event in which TS 2.19 requirements were not met with i respect to results of a surveillance test. However, LER 92-021 involved a broken fire  !

door latch, rather than Halon cylinder acceptance criteria.

NRC FORM 38BA p4g

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