ML20138G482

Summary of 970421 Meeting W/Util in Rockville,Md to Discuss Licensee long-term Plans for Resolution of Thermo-lag Related Issues.List of Participants & Copy of Meeting Handout Encl

ML20138G482
Person / Time
Site:	Clinton
Issue date:	04/29/1997
From:	Pickett D NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
TAC-M85535, NUDOCS 9705060310
Download: ML20138G482 (16)

Text

p2 ce:

M k UNITED STATES j

f o

• NUCLEAR REOULATORY COMMISSION WASHINGTON, D.C. 20666-0001

$9

• • • • • ,o April 29, 1997 LICENSEE: Illinois Power Company (IP)

FACILITY: Clinton Power Station

SUMMARY

OF APRIL 21, 1997, MEETING TO DISCUSS LONG-TERM RESOLUTION OF THERM 0-LAG RELATED ISSUES - CLINTON POWER STATION (TAC NO.

M85535)

On April 21, 1997, NRC staff members met in Rockville, Maryland, with representatives of IP. The purpose of the meeting was to discuss the licensee's long-term plans for resolution of Thermo-Lag related issues. A list of meeting participants is included as Enclosure 1, and a copy of the meeting handouts is provided as Enclosure 2.

Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers," was issued in December 1992 to convey staff concerns about the adequacy of Thermo-Lag to function as a reliable fire barrier. Due to the significance of the issues and the extended period of time since issuance of the Generic Letter, the staff requested management meetings with a number of licensees to further discuss and understand their long-term plans for resolution of these issues. Prior to the meeting, the staff identified the following areas that would need to be addressed:

- The licensee's overall schedule for resolution of Thermo-Lag related issues. This should include a discussion and chronology of major accomplishments with special emphasis on items left to be done.

- The level of management attention / support in implementing corrective actions.

- Steps that the licensee can take to accelerate the implementation of corrective actions.

- Identification of those factors that could impede the implementation schedule. If plant outages drive the final date of implementation, discuss how work may progress during forced outages.

- The level of confidence that the proposed schedule will be met.

Thermo-Lag is located in 10 separate fire zones at the Clinton Power Station (CPS). Of these 10 zones, I has b~een previously accepted by the staff, 5 will reouire modifications, and 4 will receive alternate safe shutdown analysis.

The licensee presented a schedule for resolution that has largely been in place since 1994. Through a combination of hardware modifications and safe shutdown analysis, the licensee reconfirmed previous commitments of resolving all Thermo-Lag related issues by the end of the seventh refueling outage (RF7). At that time, CPS will no longer rely on Thermo-Lag as a fire barrier. g 000033 DMY 58"2885RPs888k NRC RLE CENTER COPY

The only significant change from previous commitments is that due to the

, length of the ongoing RF6, RF7 is now being scheduled for the Fall as opposed to the Spring of 1998.

', While acknowledging that emergent work associated with the ongoing RF6 is dominating their staff's resources, the licensee stressed their commitment to meet their overall schedule for resolution. In this regard, the licensee has contracted with their A/E to perform the four alternate safe shutdown analysis. This work is scheduled to be complete in May 1998 and will be

, independent cf other Thermo-Lag related activities, i

Regarding modifications to the five fire zones, three have been completed during RF6. The remaining two zones, C-2 and CB-1g, are scheduled for completion in RF7. The licensee's schedule calls for determining the appropriate method of resolution for these two fire zones by June 1997,

completing the evaluations, planning and parts procurement by December 1997, 2

and actual hardware implementation by the end of RF7.

J Hardware modifications for both C-2 and CB-1g involve removal of the existing Thermo-Lag and replacement with a material yet to be determined. The Thermo-3 Lag in zone C-2 is inside containment located immediately below the refueling floor. This installation of Thermo-Lag is being used as a fire break between cable runs as opposed to a fire barrier. The existing Thermo-Lag is located approximately 13 to 18 fset above the floor level and is contaminated. The design of the Mark III containment structure has grating (i.e., no solid floors) between the installed Thermo-Lag and the suppression pool. Due to the dust and fibrous materials of Thermo-Lag, the licensee must take extra precautions to avoid releasing this material to the suppression pool, thus precluding the potential for ECCS pump suction strainer clogging. In order to contain the fibrous material, the licensee anticipates constructing a complex containment tent and filter system surrounding the Thermo-Lag. An initial estimate predicts 22 days for this hardware modification.

l Fire zone CB-Ig involves replacement of Thermo-Lag over conduit. This work, which will require a Division II outage, will be difficult in that the Thermo-Lag is located approximately 20 feet above the floor, near the ceiling, with very little working area for plant personnel. At most, two workers can be in 4

The area at the same time.

I The staff questioned whether any of the above work could be accelerated by performing work during the current RF6 outage or during a maintenance outage i following restart. The licensee stated that emergent work associated with the

current outage would prevent any acceleration of work during RF6. While the licensee acknowledged consideration of a planned maintenance outage in the January - February 1998 timeframe, they have not committed to one. If a decision is made to schedule a maintenance outage, the licensee will consider scheduling the modifications to fire zones C-2 and/or CB-1g after the work l packages are complete in December 1997.

l .

4'

+

l With regard to ampacity derating, the licensee responded to the staff's request for additional information in their letter of March 31, 1997. The

staff indicated that their response was currently being reviewed by i contractors and that we had no information to share at this time.

4 The staff closed the meeting by encouraging the licensee to take any necessary i steps to maintain their current schedule. The staff did not identify any i t

significant concerns over the licensee's proposed schedule for resolution and t noted that only two installations of Thermo-Lag would require modifications. '

4 i

Q vPdS Douglas V. Pickett, Project Manager Project Directorate III-3

. Division of P.eactor Projects III/IV i Office of Nuclear Reactor Regulation f Docket No. 50-461

Enclosures:

As stated cc w/encls: See next page i

1 '

1 I

i i

1 i l 2

i

p With regard to ampacity derating, the licensee responded to the staff's request for additional information in their letter of March 31, 1997. The staff indicated that their response was currently being reviewed by contractors and that we had no information to share at this time.

The staff closed the meeting by encouraging the licensee to take any necessary steps to maintain their current schedule. The staff did not identify any significant concerns over the licensee's proposed schedule'for resolution and noted that only two installations of Thermo-Lag would require modifications.

Original signed by:

Douglas V. Pickett, Project Manager Project Directorate III-3 Division of Reactor Projects III/IV Office of Nuclear Reactor Regulation Docket No. 50-461

Enclosures:

As stated cc w/encls: See next page DISTRIBUTION:

}. LARD COPY (w/encis)

Docket File PUBLIC PDIII-3 Reading OGC ACRS J. Caldwell, RIII G. Grant, RIII E-MAIL (w/ encl 1)

S. Collins (SJCl) B. McCabe (BCM)

F. Miraglia (FJM) R. Jenkins (RVJ)

R. Zimmerman (RPZ) E. Connell (EAC)

J. Roe (JWR) L. Tran (LNT)

E. Adensam (EGAl) K. West (KSW)

E. Jordan (JKR)

D. Ross (SAM)

L. B. Marsh (LBM)

G. Marcus (GHM)

DOCUMENT NAME: G:\CLINTON\CLI85535. SUM To receive a copy of this document, indicate in the box: "C" = Copy without enclosures "E" a Copy with enclosures "N" = No copy 0FFICE LA:PDIII-3 } C PM:PDIII-3 l _C NAME CBoyle U@ DPickett 3 V i DATE 04/4797 C 04/L'Y97 0FFICIAL RECORD COPY

1 .

3 1

With regard to ampacity derating, the licensee responded to the staff's request for additional information in their letter of March 31, 1997. The staff indicated that their response was currently being reviewed by contractors and that we had no information to share at this time.

The staff closed the meeting by encouraging the licensee to take any necessary steps to maintain their current schedule. The staff did not identify any significant concerns over the licensee's proposed schedule for resolution and noted that only two installations of Thermo-Lag would require modifications.

i Original signed by:

i Douglas V. Pickett, Project Manager Project Directorate III-3 Division of Reactor Projects III/IV

Office of Nuclear Reactor Regulation Docket No. 50-461

Enclosures:

As stated cc w/encls: See next page DISTRIBUTION:

HARD COPY (w/encis)

Docket File PUBLIC PDIII-3 Reading OGC ACRS J. Caldwell, RIII G. Grant, RIII E-MAIL (w/ encl 1)

S. Collins (SJCI) B. McCabe (BCM)

F. Miraglia (FJM) R. Jenkins (RVJ)

R. Zimmerman (RPZ) E. Connell (EAC)

J. Roe (JWR) L. Tran (LNT)

E. Adensam (EGA1) K. West (KSW)

E. Jordan (JKR)

D. Ross (SAM)

L. B. Marsh (LBM)

G. Marcus (GHM)

DOCUMENT NAME: G:\CLINTON\CLI85535. SUM To receive a copy of this document. Indicate in the box: "C" = Copy without enclosures *E" = Copy with enclosures *N" = No copy 0FFICE LA:PDIII-3 } C PM:PDIII-3 l _C NAME CBoyle UT) DPickett P 'i DATE .

04/4797 C 04/L'V97 0FFICIAL RECORD COPY

Clinton Power Station, Unit No. 1 Illinois Power Company cc:

Mr. Wilfred Connell Illinois Department Vice President of Nuclear Safety l Clinton Power Station Office of Nuclear Facility Safety l Post Jffice Box 678 1035 Outer Park Drive l Clinzon, Illinois 61727 Springfield, Illinois 62704 Mr. Daniel P. Thompson Mr. Paul J. Telthorst Manager Nuclear Station Director - Licensing Engineering Department Clinton Power Station Clinton Power Station P. O. Box 678 Post Office Box 678 Mail Code V920 j Clinton, Illinois 61727 Clinton, Illinois 61727 j Resident Inspector U.S. Nuclear Regulatory Commission RR#3, Box 229 A Clinton, Illinois 61727 Mr. R. T. Hill Licensing Services Manager General Electric Company 175 Curtner Avenue, M/C 481 San Jose, California 95125 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, Illinois 60532-4351 Chairrnan of DeWitt County c/o County Clerk's Office DeWitt County Courthouse Clinton, Illinois 61727 Mr. J. W. Blattner Project Manager Sargent & Lundy Engineers 55 East Monroe Street Chicago, Illinois 60603

MEETING ATTENDEES APRIL 21, 1997 I

ILLIN0IS POWER COMPANY HR_C Dan Thompson Tad Marsh Paul Telthorst Steve West Mark McHenamin Ed Connell Brian Ford Ronaldo Jenkins -

Jim Pilarski Linh Tran Doug Pickett Enclosure 1

m e ~

Ellinois Power Clinton Power Station Thermo-Lag Resolution i

Ruotaw Pta Pupmed By:

9ttecoa Poaaes Gompany m I g April 21,1997, NRC/IP meetmg ,

i

, m(m,*

, IIIssois Bower Timeline of Thermo-Lag (TL) progress and resolution schedule May 1998 7 start, 1994-1996 Present June 1997 December 1997 g__________g_______________________{________________g_____________g Thermo-Lag 3 zones Determine The evaluations, planning, Zones C-2 &

Alternate safe Commitments resolved by zone C-2 & 10CFR50.59s, parts CB-1g resolved shutdown methods modification CB-Ig to NRC procurement, outage 50.59s done for Prior to startup in RF-6 resolut,on i from RF-7 scheduling and duration Zones CB-le, i CB-6d, method to install cannot be A-la CB-If and CB-4 & determined until the D-8 CB-Sa method ofresolution is determined. ,

Event marker IP has completed 3 of 5 (60%) of the zones where modifications k Decision marker are required. One zone accepted as-is (F-lp). Four zones to complete June 1998. The two remaining before RF-7 ends.

Overall,40% of zones complete.

t i

. . . . _- ._ . .. . . .=

Timeline for CPS Themo-Lag Activities January 1994 through RF-7 in 1998 94 95 96 97 98 ID Task Name 1 l2l3 l4 1 l2l3l4 1 l2l3l4 1 l2l3l4 1 l2l3l4 1 Commit to modify zones CB-4, CB-Sa, CB-6d and CB-1g E 2/9 S4  !

2 Perform 50.59s and submit them to NRC 6/1 S 4 A Y 3/16/95 3 Zone F-1p accepted by NRC 12/15/94 X 12/15/94 4 Design mod (cation for CB-4 and CB-Sa l6/19/95 A Y 4/12S6 5 Design mod (cation for CB-6d 7/18/95 A T 8/22/96 6 Commit to reenalyze safe shutdown for zones A-la, CB-1e, CB-1f & D4 7/26/96 E 7/26/96 and modify zone C-2 7 Install modWcation f er CB-4 and CB-Sa 8/1/96 A T 1/2S 7 l

8 install mod (cation > or CB-6d '

8/26/96 A Y 3/27/97 9 Detemune resolution method for C-2 and CB-1g 3/24/97 A8 5/30/97 10 Design resolution method for C-2 4/1jg7 f% U 10/27S7 11 Reanalysis performed for safe shutdown on A-ta, CB-1e, CB-1f and D4 4/10/97 /. U 5/29/98 12 Design reso!ution method for CB-1g U 9/30!97 i 6/9/97 /\

13 Install C-2 and CB-1g resolution methods 10/1/98 M Task Completed A Y Task Scheduled /\ U f

Page 1b

IIII:nois Power Thermo-Lag (TL) resolution schedule ,

' - Commitments to-date have been met according to 1994 schedule

- Safe shutdown reanalysis commitment to be met according to schedule CPS A/E contracted (5,000 man-hours) to keep safe shutdown reanalysis effort to original completion schedule commitment (May 1998)

Vice President - Nuclear approved above contract with the CPS A/E

\

. - Modifications planned for RF-7 because at the time of the letter, it was l the only plant outage of sufficient length to accommodate the work ~

l l -

Modification commitments still to be complete prior to startup from RF-7 RF-6 length precludes having a refueling outage in the Spring of 1998 l

RF-7 being rescheduled from the Spring 1998 to the Fall of 1998

m EIHanois Power RF-6 TL modifications

- Planned RF-6 TL modifications were completed in RF-6

- Engineers now working on high safety significant emergent RF-6

. issues, e.g., degraded voltage

- Design for planned RF-7 TL modifications could not begin until the high safety significant RF-6 issues are addressed

- Conservative modification process: design, analysis (10CFR50.59s), -

planning, parts procurement, outage preparation and installation i

Ellistoin Power j CPS mid-cycle outage i

i I

CPS has not determined whether a mid-cycle outage will be conducted A potential mid-cycle outage is in the initial planning stages The length of a potential mid-cycle outage has yet to be determined A potential mid-cycle outage would likely be in January or -

February 1998

Ellinois Po3ver Resolution of remaining Thermo-Lag installations during a mid-cycle outage The method of resolution should be determined by June 1997 The design packages should be prepared by December 1997 .

In December 1997, it will be determined if the proposed design packages can be installed during a mid-cycle outage If the method of resolution can be fit into a mid-cycle outage, it would be preferable instead of during a busier refueling outage; however, below are areas of concern:

Containment (C-2) -

Contamination control Fibrous material control Configuration and location ofinstallation Fire zone CB-lg -

Divisional outage required Configuration and location ofinstallation l

' EHinnois Power Additional Fire Zone C-2 Information

- TL immediately below refueling floor,13-18 feet above floor level This location leads to the TL material being contaminated The trays are stacked one atop another 13-18 feet above the floor The TL installation is in a narrow section (4-9 foot wide) of containment I -

There is no solid floor between the TL installation and the suppression pool There will be dust and other fibrous material on and in the TL installations Potential for ECCS suction strainer clogging must be acknowledged Foreign material must be controlled while on-line A complex containment tent and filter will be required to contain fibrous material Approximately 1,000 man-hours required to remove TL material from trays Minimal plastic, which could block suction strainers, is allowed in containment Replacement material yet to be determined

. i

. t IIIIssein Power l

Additional Fire Zone CB-1g Information l

- A Division II outage will be needed

! - Division II outage length: From when the circuit is interrupted until the circuit is reestablished with the proposed resolution The TL installation is approximately 20 feet above the floor

- The TL installation is in the upper corner of the room Very little working area will be available around the TL installation At most, two workers can be in the area at the same time

. Pre-staging, cable routing and scaffold building can be done on-hne

- However, confined area and minimal crew size extends critical path time Replacement material yet to be determined i

I

---

- - - - - -- - - - - - - - - - _ _ - _ -