ML20215D759

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Submits Written Followup on 860923 & 24 Request & Granting of Temporary Waiver of Tech Spec Requirements Re Limiting Conditions for Operation.Background Info Re Request Discussed.Related Info Encl
ML20215D759
Person / Time
Site: Mcguire
Issue date: 09/25/1986
From: Tucker H
DUKE POWER CO.
To: Grace J
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8610140283
Download: ML20215D759 (16)
v • d • e


Text

y6 DUKE POWER GOMPANY P.O. box 33180 CHAMLOTTE, N.C. 28242 g,sg M;h HAL B. TUCKER TELEPHONE m om.a.

September 25, 1986 Dr.

J.' Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta St. NW, Suite 2900 Atlanta, Georgia 30323

Subject:

McGuire Nuclear Station,' Unit 2 Docket No. 50-370 Relief From Technical Specification LCO (Temporary Waiver)

Dear Dr. Grace:

This letter constitutes written followup of a request for temporary waiver of technical specification requirements which was made (and subsequently granted) via telecons between Duke Power Company personnel and members of your staff on September 23 and 24, 1986. This temporary emergency relief from compliance with technical specification Limiting Conditions For Operation (LCO) avoided unnecessarily shutting down McGuire Unit 2 since the LCO's allowed outage time (AUT) was exceeded prior to completion of corrective actions.

On September 11, 1986 McGuire Unit I and 2 Auxiliary Building Filtered Ventilation Exhaust (VA) Systems carbon samples were pulled and sent for analysis in accordance with Technical Specification surveillance requirement 4.7.7.c.

This surveillance requiren,ent demonstrating operability of the VA System specifies that a representative carbon sample be obtained after every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of filter system operation, with sample analysis to be performed within 31 days of removal to vedify a methyl iodide penetration of less than 1% (i.e. 99% efficient). Results of the 9/11/86 Unit 1 VA carbon sample analysis were received on September 17, l

1986 (99.77% efficient), and the Unit 2 results were received on September 23, 1986 (98.51%).

Consequently, since the Unit 2 results failed the 99% efficiency l

criteria, the Unit 2 VA System was declared inoperable pursuant to Technical Specification 3/4.7.7 at 11:34 a.m. on September 23, 1986. This specification l

provides for a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> A0T after which the Unit 2 VA System would have to be i

restored to operable status or the unit placed in at least Hot Standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in Cold Shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

i Although Duke immediately initiated corrective action efforts for carbon change-out, this process cannot be accomplished in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> (replacing and testing of the carbon beds of the VA System filter takes about 5 to 7 days). Accordingly, on September 23, 1986 Mr. N.A. Rutherford et.al. (DPC) contacted Mr. V.L. Brownlee

)

et.al of your staff requesting a 4 day (96 hour0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br />) extension to the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> A0T to l

allow for carbon bed replacement / testing to be completed. This request was based l

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Dr. J. Nelson Grace September 25, 1986 Page 2 on the essentially redundant (see Attachment I and the proposed technical specification change referenced below) Unit i VA System being operable (currently operating in the filter mode), the low probability of an accident requiring use of the VA System during this short time period, and the desire to avoid a thermal cycle on the reactor and associated systems which has real benefits in terms of availability, component lifetime, and safety. Following discussions between Duke Power Company personnel and members of your staff (along with assistance from NRC/0NRR), this temporary waiver request was verbally granted by Mr. Brownlee et.al. on September 24, 1986. During these discussions, NRC/0NRR raised a concern regarding VA System performance on level 695' (ECCS pump rooms). Duke commits to a good faith effort to improve system performance in this area, with the goal of meeting 0.25"WG relative to atmosphere on this level. Another flow verification test is scheduled for late in the week of September 29, 1986. A plan by which McGuire will pursue the performance goal will be provided by October 7,1986.

It should be noted that Duke was previously aware that 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is not a sufficient amount of time for certain VA System corrective actions or performance of other maintenance when the system is inoperable (two previous emergency Technical Specification 3/4.7.7 changes were pursued for similar reasons -

reference McGuire Facility Operating Licenses NPF-9 and NPF-17 amendments 24(Unit 1)/4(Unit 2) and my letters to Mr. H.R. Denton (NRC/0NRR) dated September 20 and 23, 1985).

In view of this, via my letter to Mr. Denton dated September 16, 1985 Duke submitted proposed technical specification changes which would increase the time allowed to restore an inoperable VA system train to operable status to 7 days. This license amendment request is currently under NRC review. As a result of ongoing NRC review of McGuire's VA system and proposal of September 16, 1985, several items have been identified where additional information is requested (e.g NRC/0NRR letters to DPC of November 29, 1985 and December 20, 1985; NRC/0IE Inspection Report 50-369/86-01 & 50-370/86-01, and 50-369/85-39 & 50-370/85-40; concerns addressed in the June 19, 1986 SALP Board Report; and items raised during discussions related to this tempcrary waiver request). These items will be I

addressed by separate correspondence by October 7, 1986.

Replacement / testing of the Unit 2 VA system's carbon bed is currently in progress and it is anticipated that the system will be declared operable prior to the l

expiration of the extended A0T. Duke would like to express its appreciation for l

the NRC's timely cooperation in this matter. Should there be any questions or if I

additional information is required, please advise.

Very truly yours, W

7 i

g/fL Hal B. Tucker PBN/32/j gm Attachment

Dr. J. Nelson Grace September 25, 1986 Page 3 xc: w/ attachment Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Mr. Dayne Brown, Chief Radiation Protection Branch Division of Facility Services P.O. Box 12200 Raleigh, NC 27605 Mr. Darl Hood Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Mr. W.T. Orders NRC Resident Inspector McGuire Nuclear Station

~

il ATTACHMENT 1 Justification for VA Redundancy.

Air Flow Testing Testing performed on the auxiliary building ventilation exhaust system demon-strates the system capable of maintaining a slight negative pressure in the building with only one (1) of two (2) exhaust fans operating. Since the McGuire auxiliary building is a structure common to both reactor units,_ the exhaust trains are therefore considered redundant with respect to building pressuriza-tion and filtration bases.

With the smaller two (2) of four (4) fans operating. the system demonstrates a measurable negative pressure with respect to the atmosphere, and maintains air flow from adjacent areas into the auxiliary building.

Testing was also per-formed with only one (1) of four (4) fans operating, and similar results were obtained. Reference the attached simplified system schematic for illustration.

Two floors of the auxiliary building are at least partially above grade. The remaining three floors are below grade with tightly sealed boundary walls at adjacent structures.

ECCS pumps and other sources of leakage are located in the lower elevations.

For comparison of building pressure with respect to atmo-sphere and adjacent areas, six representative points were randomly chosen.

These points are identified on the attached arrangement drawings, and are listed below with numbers corresponding to the identified points of measurement:

1.

A door leading directly to the outside from the radwaste area.

A fresh air intake plenum directly connected to the outside.

2.3&4. A central stairwell serving all levels of the building, intentionally opened to the outside atmosphere. This provided a reference pressure for observation at two levels.

S&6. Doors in the boundary between the control complex ventilation system and the auxiliary building exhaust system.

In addition to air flow redundancy demonstrated by testing, the control logic for automatic actuation of the exhaust system will start both systems in the event of an emergency in either reactor unit.

This feature assures adequate filtration and establishes the desired negative pressure under all applicable conditions.

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El. MS Fly l 2 2-l

i e

CONTROL SWITCH ON 1ABFX-ECP-1A IN

  • ON' POSITION i

LOCA OR BLACKOUT j

IN UNIT 1 OR ABFXF-1A

' ON' 1

LOCA OR BLACKOUT IN UNIT 2 4

4 ABFXF-1A a

LOGIC DI AGRAM-[S/spaf/dr M/*

/B,2A,28) i

~ J

)

Tf/0/A/9100/106

~

Paga 1 of 3 DUKE POWER COMPANY NcGUIRE NUCI. EAR STATION AUXILIARY BUII. DING PRESSURE VERIFICATION 1

l 1.0 Purpose To verify that the Auxiliary Building can be maintained at a negative pressure with respect to atmosphere with only the smaller of the two Auriliary Building filtered exhaust trains operating.

2.0 References 2.1 Auxiliary Building System Description, NCsD-0166-00 2.2 Unit 1 VA Flow Diagram, MC 1577-1.0 2.3 Unit I and 2 VA Flow Diagram, NC 1577-2, -4, -5 3.0 Time Raouired Two hours, using one test coordinator and one technician.

4.0 Prereouisite Tests None 5.0 Test Eauipment 5.1 0-10 in. manometer w/ tubing 5.2 Smoke 8 ticks 6.0 Limits and Precautions 6.1 During the test, Chemistry sample fume hoods and the Radwaste Air Randling Unit, along with aux bids, supply units will be tripped when either filtered exhaust train is shut down.

7.0 Reentred Unit Status i

None 8.0 Prereouisite Svetes Conditions None 9.0 Test Nothod l

The Unit 1 Auxiliary Building filtered exhaust train will be shutdown, which trips the Auxiliary Buiiding supply air handling units.

Differential pressure measurements will then be takjn at various aux bids /atmospher',and aux bids / Control Room area interfaces. These e

measurements (or flow verification by smoke stick if pressures are too small to measure) will be made with both Unit 2 exhaust fans operating, and again with only one Unit 2 exhaust fan operatins.

1 O

XEROX TELECOPIER 295 ;

9-23-86; 4:21 PM; 70487513584165 +

3738033 ; e3

/0

)

Tr/0/A/9100/106

~~

Page 2 of 3 10.0 Data Reautred 10.1 Differential pressure or verification of inleakage via smoke stick at each Auxiliary Building boundary tested.

11.0 Acceptance Criteria 11.1 Auxiliary Building is at a negativa pressure with respect to atmosphere and Control Roost area.

S S

a

  • O

_-.___________,,_m-

XERO;(.TELECOPIER 295 :

9-2'3-86: 4:21 PM:

70487513584165 +

3730033 : e4

//

1

??/0/A/9100/104 Page 3 of 3 l

12.0 Procedure NOTE: IV means that Independent Verification is required.

leiticl/Date Ensure Unit 1 VA Filtered Exhaust Fana are OFF, and Unit 1 and

/

12.1 Unit 2 VA Supply fans are OFF.

Ensure Unit 2 VA Filtered Exhaust Fans (A and B) are ON.

/

12.2

/

12.3 Complete Enclosure 13.1.

/

12.4 Shut down Unit 2 VA Filtered Exhaust Fan B.

/

IV Ensure that Unit 2 VA Filtered Exhaust Fan A is the only fan (7A

/

12.5 supply or exhaust, either unit) operating.

/

12.6 Complete Enclosure 13.2.

Return VA system.ontrol to Operations. Apprise operations c

/

12.7 that all VA supply fans are off and only Unit 2 VA Filtered

/

IV Exhaust Fan A is operating, so that system tagging for continued VA day maintenance, or system restoration may proceed, as required. IV blank should be signed by OPS representative.

13.0 Enclesures Auxiliary Building Pressure Data (Unit 2 Exhaust fans A and B) 13.1 Auxiliary Building Pressure Data (Unit 2 Exhaust Fan A) 13.2 O

s D

e r---.----,

,-.,,,,..-_--.,---.------wn.--,--,---n.,e_,--

_-am._

-,-n-.__w,.--.--,-

,-.n.,

,._.n,_.

295 :

9-23-86: 3:22 PM:

70407513584165 +

3738033 : #4 XEROX.TELECOPIER

/ h i 3.1

]

TT/0/A/9100/106 Pese 1 of 1 Auxiliary Building Pressure Data Unit 2 Exhaust yans A and 3 Record system flow as read by 2VAP09370.

M,,D cfm

^

1.

Record differenti=1 pressures from Auxiliary Building to atmosphere by placing 2.

If tubing from sann: enter an nither side of the following boundary doors.

pressures are too ass 11 to be accurately recorded, test for ininakage using a N/A the AP data blank and initial the "Inleakage Verified by Smoke smoke stick.

5 tick" column as required.

For pressure boundaries using the Auxiliary Building center stairwell as NOTE:

atacepheric pressure, assure that the top stairwell door and hallway-to-roof drors are open, and all other stairwell doors are closed.

Inleakase Verified By AP (in.wal Smoke Stick Pressure Boundary

, /4 WA Westa Shipment Area Door to N2rth Yard (760' E1.)

".3I N/A VA Supply) Unit Intry Hatch (767' E1.

e4 /A _

4 f,f1 750' El. Door to center stairvell NA_

f, I3 733' 11. Door to center B

stairwell l

Record differential pressures from Auxiliary Building to Control Room area by If 3.

placing tubing from manometer on either side of the following boundary doors.

pressures are too small to be accurately recorded, test for inlaskage using a N/A the AP data blank and initial the "Inleakage Verified by Smoke smoke stick.

Stick" column as required.

9 Inleakage Verified By Smoke Stick AP (in.wa)

Pressure Ee" A rv PMA _

h 767' 11. Door to GAPPT-2 Room

" ded 3 Nk 750' El. Door to Cable

~

l Spreading Room Data Recorded By AM M

eh/u Dat. _

a r

g Inclosure 13.2 j

TT/0/A/9100/106 Auxiliary Building Prcosurs Data Pas 3 1 of 1

/)

Unit 2 Exhaust Fan A 8 f> @ d cfm Record system flow as read by 2VAPG9370.

1.

f. *Macord diffe'rential pressures from Auxiliary Building to atmosphere by placing If rubing from manometer on either side of the following boundary doors.

pressures are too ses11 to be accurately recorded, test for islaskage using a N/A the AP data blank and initial the "Inleakage Verified by Smoke asoke stick.

Stick" coluem as required.

For pressure boundaries using the Auxiliary Building center stairvell as N_04:

atmospheric pressure, ensure that the top stairwell door and hallway-to-rsof doors are open, and all other stairwell doors are closed.

Inleakage Verified By AP (in.wa)

Seeke Stick Prsseure Boundary

- 0,03 he, N/A Westo shipnent Area Door to Marth Yard (760' E1.)

tJd

- 0,lo VA Supply Unit Entry Hatch

~

(767' El.)

'-0,0%

N/A 750' El. Door to center i

steirvell

- 0, d_1 N/A 733' El. Door to center r

i stairwell..

Record differential pressures from Auxiliary Building to Control Room area by 3.

If placing tubing from manometer on either side of the following boundary doors.

pressures are too small to be accurately recorded, test for inleakage using a N/A the AP data blank and initial the "Inleakage Verified by Smoke smoke stick.

Stick" column as required.

l faleakase Verified By AP fin.wal Smoke 8 tick Prsseure Boundary I

M /A _

M 767' El. Door to OAPIT-2 i

i R:ee

-0.03 N/A _

750' El. Door to Cable Spreading Room Data Recorded By

/M PX4fb---

4 /11JM Date'-

.g DOI NS M

8I h h4 Afdd. ($

E i=> h, &pit *>Stu' A *4 Par a.t caus k O c f

h

^ 6 ledes 5

%ewel

~

__

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