ML20099B404
| ML20099B404 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 07/28/1992 |
| From: | Broughton T GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| C311-92-2102, IEB-92-001, IEB-92-1, NUDOCS 9207310133 | |
| Download: ML20099B404 (44) | |
Text
- :,-
GPU Nuclear Corporation Nuclear =rsweo Middletown, Pennsylvania 17057 o191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:
4
- (717)948-8005 I
July 28, 1992 l C311-92-2102 l
l V. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 i
Dear Sir:
Subject:
Three Mile Island Nuclear Station, Unit I (TM1-1)
Operating license Nc. DPR-50 i Docket No. 50-289 Response ta NRC Bulletin 92-01: Failure of Thermo-Lag 330 Fire Barrier System to Maintain Cabling in Wide Trays and Small Conduits Free from Fire Damage The purpose of this letter is to provide notification, as requested by Bulletin 92-01, that TMI-l has installed Thermo-Lag 330 fire barrier systems at the facility. It also describes the actions taken at THI-l with respect to the fire barrier systems (envelopes) to determine their operability. Although the Thermo-Lag 330 fire barriers have been determined to Se operable, they
, remsin a subject of concern.
THI-l License Condition 2.c.(4) requires the implementation and maintanance of all provisions of the Fire Protection Program as described in the Updated FSAR for THI-1. The Fire Protection Program consists of Chapter 9.9 of the FSAR.
the Fire llazards Analysis Report, and Administrative Procedure (AP) 1038,
" Administrative Controls - Fire Protection Program". Exhibit 2, section 7.3.2 of the AP allows use of other compensatory measures for defective envelope systems in lieu of a posted, continuous fire watch provided a Plant Review Group (PRG) review of the adequacy of ' imeasures and the loss of protection versus function is performed. Envelope operability was determined by PRG review in accordance with TMI-l license requirements.
One and three hour Thermo-Lag 330 material is installed in the Control Building, Auxiliary Building, Fuel Handling Building and the Intake Screen and Pump House. The areas are identified in the Fire Hazards Analysis Report (Revision 14). For the purpose of surveillance inspection, to meet f
- 9207310133 920728 '
d ';- jI PDR G
ADOCK 05000289 PDR GPU Nuclear Corporation is a subsidiay of General Pubhc Utihties Corporation
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, Document Control Desk C311-92-2102 Page Two i
the requirements of AP 1038 Exhibit 2. Section 7.4.1.1, the areas are also listed and shown on floor plan drawings in Surveillance Procedure (SP)
! 1303-12.24 "TSI Fire Barria. Inspection". The specific areas are identified on Attachment 1. Of the areas identified, all but two (FH-FZ-6 ard ISPH-FZ-1) have ihermo-Lag 330 barriers which are the subject of concern of IEB 92-01; ie., barriers installed on tray larger than 14 inches wide and conduit smaller
- than 4 inches. Attachment 2 shows, in red, the physical locations of these
- barriers in the plant and lists the circuits / function being protected.
! In plant areas where the Thermo-Lag barriers of concern are installed GPUN initiated a precautionary roving fire watch on 6/25/92 following the Plant
- Review Group initial review. Attachment 3 identifies the chronology of
. actions and includes additional information considered during PRG meetings j that ultimately led to the suspension of the fire watch at TMI on 6/30/92. A
- fire brigade bulletin, outlining the concerns of IEB 92-01 and showing the
. barrier locations, provides the fire brigade teams and Operations personnel -
special directions for fighting fires where Thermo-Lag 330 fire barrie
~
material is installed.
THI-l will continue to evaluate information regarding the Thermo-Lag 330 fire barrier material as it becomes available. In the meantime, a walkdown
- inspection of a sampling of barriers subject to the concern has been made with no cracks, deficiencies or degraded conditions identified. Combustibility 4
testing of THI-l material by an independent test facility has been arranged and previous test results and engineering reports are being ro-ext.ained. Thus far, the results continue to support past engineering decisions and the recent Thermo-Lag 330 fire barrier operability determination.
Sincerely, hN w k&~
T. G. Broughton Vice President and Director, THI-1 WGH Attachment cc: Administrator, Region I TMI Senior Resident Inspector
_ - . - . - ~ . - _ . . _ _ _ . - . .
C3)l-92-2102 -
METROPOLITAN EDISON COMPANY l JERSEY CENTRAL POWER AND LIGHT COMPANY l 4 i.
- PENNSYLVANIA ELECTRIC COMPANY i
GENERAL PUBLIC UTILITIES NUCLEAR CORPORATION Three Mlle Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 ,
Decket No. 50-289 Response to NRC Bulletin No. 92-01:
Failure of Thermo-Lag 330 Fire Barrier System ,
to Maintain Cabling in Wide Cable Trays and Small Conduits Free From Fire Damage This letter is submitted to provide a written response describing our actions taken associated with NRC Bulletin No. 92-01: " Failure of Thermo-Lag 330 Fire.
Barrier System to Maintain Cabling in Wide Cable Trays and Small Conduits Free -;
From Fire Damage." All statements contained in this response have been reviewed, and all such statements made and matter set forth therein are true and correct to the best of my knowledge.
Yw;lbrw T.-G. Broughtod Vice President and Director, THI-1--
Signe'd and sworn before me this ;
28th day of' July , 1992.- l YEY NgQry Public f Y IL $ _
LNM M/Commisson Expires Aug.21,1993 oacnn N i' Muntxa,Punre e ksiaWof Mastes
. . . _ . _ . . . . - _ . - - - . - - . . , - - . .- _.-.____-.a.- --.-. _
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Attachment 1 C311-92-2102 i
Fire Zones at 1Mi-1 in which One and Three Hour Thermo-Lag 330 i Fire Barrier Material is Installed 2
Fire Area gyildino-Elevation Area Name-Deteriotion CB-FA-1 Control Bldg. 306' General Area, Chemistry & HP ,
, CB-FA-28 Control Bldg. 322' 15 480 V Switchgear Room i CB-FA-2C Control Bldg. 322' Technical Support Center Area CB-FA-20 Control Bldg. 322' East Battery Charger / Inverter Room CB-FA-2E Control Bldg. 322' West Battery Charger / Inverter Room CB-FA-2F Control Bldg. 322' East Battery Room CB-FA-2G Control Bldg. 322' West Battery Room CB-FA-3A Control Bldg. 338' 10 4160 V Switchgear Room CB-FA-3B Control Bldg. 338' IE 4160 V Switci. gear Room FH-FZ-5 Fuel Handling 322' Patio Area FH-FZ-6 fuel Handling 285' Chiller Room FH-FZ-1 Fuel Handling 281' General Area - Basement FH-FZ-2 Fuel Handling 306' Hot Machine Shop - Hallway AB-FZ-3 Auxiliary Bldg.281' Valve Alley AB-FZ-4 Auxiliary Bldg.281' Penetration Area AB-FZ-5 Auxiliary Bldg.281' Hallway and General Area AB-FZ-7 Auxiliary Bldg.305' Closed Cycle Cooling Pump Area ISPH-FZ-1 Intake Screen
& Pump House 308' 1R Switchgear Area ISPH-FZ-2 Intake Screen
& Pump House 308' 1T Switchgear Area l
'Attadhment 2
-C311-92-2102 Pgge 1 of 35 i
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- BARRIZE EEFCTION PROTECTED j A 1FHC-TB01 - MU-P-1C POWER B 1FHC-FB022 - NR-V-1C CONTROL DR-V-1B CONTROL EE-SGESSH-1T CONTROL / INDICATION
NR-P-1C CONTROL
! DR-P-1B CONTROL / INDICATION f EG-CCESSH-1B CONTROL / INDICATION (480V ENGD. SFGDS. SH. MCC)
C 1FHC-FB03 - MU-V-37 CONTROL MU-V-14B CONTROL I MU-V-16C CONTROL
' MU-V-16D CONTROL IC-V-2 MU-P-1C
\ D 1FHC-FB04 - EE-SGESSH-lT POWER (480V IT ENGD. SFGDS.
l SH SWGR.)
i i- E 1FHC-FB05 - EE-SGESSH-1T CONTROL / POWER (480V ES SH SWGR, 1T.)
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F 1FHC-FB06 - SP6B-PT1 INST / SIGNAL (STEAM GEN. B OUTLET j PRESSURE)
SP6B-PT2 INST / SIGNAL (STEAM GEN. B OUTLET PRESSURE) _
- 4 RCl-LT3 INST / SIGNAL (PRESSURIZER LEVEL)
- PT-951 INST / SIGNAL.(STEAM GEN._B. PRESSURE B) i LT-776 INST / SIGNAL (STEAM GEN. LEVEL - FULL I RANGE B)
- RCZ-TE2- INST / SIGNAL (PRESSURIZER TEMPERATURE)
G 1FHC-FB07 - MU-V-36 CONTROL l RC-RV-2 CONTROL (PRESS. RELIEF BLOCK VALVE)-
IC-V-3 CONTROL l
H 1FHC-FB08 RC4A-TE1 INST / INDICATION- (T.C OUTLET TEMP WIDE i RANGE) .
$ PT-950 INST / INDICATION (STEAM GEN.oA PRESSURE A)
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,' Page 23 of r, FH-FZ-1 (CONTINUED)
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RANGE)
, K 1FHC-FB11 - RCSA-TE4 INST / INDICATION (RC INLET TEMP WIDE RANGE)
L 1FHC-FB12 -
MU-V-37 CONTROL j RC-RV-2 CONTROL K-V-3 CONTROL 0 1FHC-FB15 - SP6B-PT1 INST. INDICATION (STEAM GEN. B OUTLET PRESSURE)
SP6A-PT2 INST. INDICATION (STEAM GEN A OUTLET PRESSURE)
RCl-LT3 INST. INDICATION (PRESSURIZER LEVEL)
PT-951 INST. INDICATION (STEAM GEN. B PRESSURE -B)
LT-776 INST INDICATION (STEAM GEN. LEVEL - FULL RANGE -B)
RC2-7E2 INST. INDICATION (PRESSURIZER - TEMP) 4
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'Page'25 of 35 H-FZ-2 BARRIER EUXCTION PROTECTED V 1CCD-FB23 MU-V-37 CONTROL IC-V-2 CONTROL DH-V-6B CONTROL I
, Attachment 2 C311-92-2102 Page 26 of 35
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l AB-FZ-4 BARRIER FUNCTION PJtOTECTER F 1AXC-FB06 - NR-V-15A CONTROL NR-V-15B CONTROL G 1AXC-FB07 -
MU-V-14A POWER H 1AXC-FB08 - MU-V-14A CONTROL J 1AXC-FB10 - LT-808 INST SIGNAL (BWST LEVEL -A)
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.C311e92-2102 Page 33 of 35 An_pz_7
- 1 BARRIER EUNCTION PROTEC7fJ2 3
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! D311-92 2102 l l Page 35 of 35 ISPil-FZ-2 I
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', BARRIE,8 DJJLCTJON PROTECTEQ !
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C ISHD-FB03 NR-V-1A CONTROL I NR-P-1A CONTROL / INDICATION 4 EG-CCESSH-1A CONTROL (480V ENGD SFGDS SH MCC) I
! EE-SGESSH-1R CONTROL (480V 1R ENGD SFGDS SH SWTGR). .
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J Attachment 3 C311-92-2102 j Page 1 of 4 t
i In plant areas where the Thermo-Lag barriers of concern are used, GPUN l initiated a precautionary roving fire watch on 6/25/92 following the PRG l review (Hinutes92-061). The initial interpretation of the bulletin led TMI personnel to believe the concern applied to traterial applications on tray 1
larger than 14 inches and conduit one inch or smaller. The scope was j subsequently revised to apply to all conduit of less than four inches.
l THI-l evaluated the material, design, and installation concerns identified in IES 92-01 and IEN 92-46 and those previously identified by IENs 91-47 and 4
91-79. It was concluded that the 1MI-1 barriers were operable. This was
- based on the guidance in Generic Letter 91-18 on Operability Determinations. 1 i Since the combustible loadings are higher in the Control Building areas, the
- hourly roving watch was assigned to these areas as a precaution until further i evaluation could be performed. In addition, hot work was minimized in the j areas with the barriers.
f On 6/26/92 (PRG Minutes92-062), the requirements of the roving watch were I
- reduced to cover only the IS 480 V Switchgear Room. This determination was ,
made after reviewing fire loadings and protection. The barriers were still considered operable. Later on 6/29/92 (PRG Minutes92-063), the IE 4160 V
- Switchgear and East Inverter Rooms of the Control Building were returned to i the list of areas covered by the precautionary roving fire watch. Evaluations i that had been in progress identified one inch and smaller diameter conduit protected by Thermo ' 330 preforms. The PRG again confirmed the " operable" J
status and considerc ne roving firewatch in these areas a precautionary measure, i
On 6/30/92 (PRG Minutes92-064), review of the remaining three areas subject j to the hourly roving fire watch was completed. An evaluation using the l guidance contained in Generic Letter 86-10 wr.s prepared and reviewed by the
] PRG to support this conclusion. The PRG concluded that the fire barrier ,
, envelope systems were operable per AP 1038, that transient combustible '
! controls per AP 1035 were in place to minimize the risk of an unanalyzed
- exposure fire from challenging the barriers and hot work controls per 4 j maintenance procedure 1410-Y-26 were in place.
4 An SER requires THI-l to comply with 10 CFR 50, Appendix R. III. K. 1-8 1
for control of transient combustibles. These controls established fire
- loading limits for fixed and transient combustibles such that without 4
compensatory action, fire loading may not exceed 0.5 times the fire loading i
that will challenge the lowest rated fire barrier in the space. Transient combustible controls also consider the characterization, configuration and location of the transient combustible within the area. Therefore, Thermo-Lag 4 was not judged to be challanged.
- Considerations which provided additional justification for the deMrmination
- of operability and suspension of the roving fire watch centered on
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!,.6 Attachment 3 C311 s2-2102 j Page 2 of 4 1
1 QA/QC inspection of material and surveillance of installation- GPUN
) returned the first shipment of Thermo-Lag fire barrier material to TSI because it was substandard. A GPUN vendor surveillance inspector was assigned to TSI in St. Louis to assure that material shipped to TMl met procurement requirements. An inspection plan was used to assure that j material attributes were consistently verified. Material was inspected i for weight and thickness. The material was reinspected by QC receipt i inspectors at IMI prior to release for use. Material voids found during i barrier f:brication were repaired if minimal labor was required or the j material set aside for return to TSI.
! QC inspectors performed a 100% inspection of fire barrier material
! installation activities.
. 2 Design Control- The fire barrier material installation configurations used at THI-l were bounded by approved fire tests or the Generic letter
- (GL) 86-10 evaluation for small diameter conduit. Regarding elevated cable temperature in the 30 inch tray test, the Construction Technology
- Laboratories Inc. Report of October 1989 identified that one cable l reached 369'F at the end of three hours. TM1-1 has evaluated plant i specific cables within these envelopes and has concluded that they remain i operable and free of fire damage.
THI-l identified the concern with protection of small diameter conduits
- early in the installation phase while applying tested configurations to those needed in the plant. Heat transfer estimates showed that conduits equal to or less than 1.5 inches would become a thermal problem due to l inadequate mass. The original plan was to wrap small diameter conduits
- with Thermo-Lag 330 Flexi-Blanket and then use a larger preform barrier.
It became obvious that the approach would be very difficult, since it would involve an additional seismic issue (dead weight supported by i hangers) and in some cases be impossible to install due to space considerations. GL 86-10 guidance was used in preparation of an evaluation which was issued with a revision to the specificetion that
, eliminated the pre-wrapping requirement. The evaluation addressed fire loading and was based on time and heat transfer.
GPUN was not aware that ASTM E136 was applicable to this type material.
- TSI has never run an ASTM E136 test. Reviewing other fire barrier product manufacturer's literature, we find that ASTM E84 was used as a
! qualification. The Thermo-Lag 330 system products are, however, UL listed (R6076 N and R6076 B) as well as ir. Industrial Test Lab Report i #81-9-92. CPUN considers ASTM E84 to be the required test for this material under APCSB 9.5-1, Section D.1(d). An ASTM E136 is being
- arranged at Southwest Research Institute (SRI) by GPUN.
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, .. o Attachment 3 C311-92-2102 Page 3 of 4 Tira ampacity derating issue addressed by IEN 92-46 was also examined during the Thermo-Lag 330 fire barrier installation. The TSI values were questioned and, as a result, temperatures were monitored inside Thermo-Lag 330 envelopes during normal plant o>eration. A copy of preliminary data retrieved from the records shows t1at as-installed TMl specific data was developed. This data was used to evaluate derating for )ower circuits of concern. Therefore, THI-l having previously addressed tie ampacity deratingissue,hasmadeitsoperabilitydeterminationssupportedby field measurements. This data has been forwarded to NRR tnrough the site NRC Senior Resident.
3 Training / procedures- THI used TSI personnel to train engineers, project managers, foremen, Quality Ccntrol and available craft personnel in the techniques used to assure quality barrier installation. The activity was handled as a special process. Procedures for installation, repair, and QC inspection and surveillance and joint design sketches were developed based on TM1 experience and the manufacturer's requirements.
4 Installation- Installation was aerformed with approved material by trained personnel and inspected )y trained inspectors. Joints were considered to be a weak link in the fire barrier system. Shrinkage of the trowel grade material during training identified the need for at least two applications and sometimes three to four (in addition to pre-buttering) were necessary to assure that the material at the joint met thickness requirements. Additionally, stress skin was required to be installed over the outside of joints on three hour barriers.
Only stainless steel banaing was used it TM1-1; no alun.Inum. The maximum separation between bands was 12 inches. Banding installation at THI-1 resulted in the use of considerably more banding than the minimum.
Because of the desire to maintain future access to trays, the tray cover was banded separately. The installation process involved placing and banding the bottom piece first, buttering the sides with trowel grade, installing and banding them with the bottom. Tne tray cover was then installed and banded last. The 12 inch se)aration applies to the final- ,
top banding which goes completely around t1e envelope assembly.
On 7/10/92 (PRG Mirutes92-066), the PRG met to review and discuss the-concerns identified at the 7/7/92 NRC-NUMARC meeting. The PRG concluded that the barriors were operable and agreed that as an additional conservative measure, a fire brigade bulletin alerting the brigade members and Operations personnel to the concern, be initiated and implemented as required reading.
It identified the location of the barriera (concern now applied to all conduit smaller than 4 inch), stressed the importance of eliminating an exposure fire that could challenge the barriers, stressed the need to avoid direct application of hose streams in the immediate area of the barriers, and
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Attachment 3 C311-92-2123 Page 4 of 4 the circuits / functions protected. Identification of the circuit and function supplements TM1's very detailed Fire Mitigation P:oceduro (OP 1104-45P) and
'>rovides Operations information needed in advance in the event a barrier is areached by fire. A note on hose streaus was considered necessary. Even though these areas are t ovided witn " fog only" nozzles on the hose reels, other combination nozziss are available and interchangeable. The brigade is trained on nozzle selection. It is unlikely that a solid stream nozzle would be used in these plant areas. The information in the fire brigade bulletin has been incorporated in the fire pre 31ans as additional information on the affected areas. These preplans have 3een utilized in fire drill scenarios since 7/16/92. Four of six operating shifts will be exposed to a fire brigade drill of this type during the current quarter. The two remaining will be drilled early in the fourth quarter.
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