ML20154P385
| ML20154P385 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 05/26/1988 |
| From: | Hood D Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20154P387 | List: |
| References | |
| TAC-56472, TAC-56473, NUDOCS 8806030318 | |
| Download: ML20154P385 (4) | |
Text
1 l
3 May 26, 1988 Docket Nos.
50-369 ar.d 50-370 LICEllSEE: Duke Power Company FACILITY: McGuire Nuclear Station, Units 1 and 2
SUBJECT:
SUMMARY
OF SITE VISIT AND MEETING OU GROUNDWATER LEVEL MONITORING AND CONTROL (TACS 56472 AND 56473)
On April 12, 1988, the NRR staff visited the McGuire Nuclear Station, Units 1 and 2, to review the Groundwater Monitoring and Control System.
The review is associated with a request by the licensee, dated October 31, 1984 and revised January 27, 1988, to change the associated Technical Specification 3/4.7.13 "Groundwater Level" to reflect a revised groundwater level control strategy. provides a summary of this visit.
In support of the licensee's proposed technical specification changes, copies of the existing procedures and draft copies of proposed procedures regarding actions in response to annunciator alarms for increased groundwater levels were provided to the NRC (Enclosure 2).
The staff also received copies of the Problem Investigation Repcrt (Enclosure j
- 3) for the January 1988 alert alarm condition for groundwater monitor MK.GWA-2 located at the exterior of the Unit 2 Reactor Building, and copies of drawing q
?!C-1220-73 (Enclosure 4) showing details for the exterior groundwater monitors within the underground filtering medium.
- <1 Original signed by:
' j j, Darl S. Hood, Project Manager yj Project Directorate 11-3 Division of Reactor Projects - I/II
!I,
Enclosures:
As stated l
cc:
See next page i
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UNITED STATES o
NUCLEAR REGULATORY COMMISSION e
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,I WASHINGTON, D. C. 20555
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May 26, 1988 Docket Nos.
50-369 and 50-370 LICENSEE:
Duke Power Company FACILITY: McGuire Nuclear Station, Units 1 and 2
SUBJECT:
SUMMARY
OF SITE VISIT AND HEETING ON GROUNDWATER LEVEL MONITORING AND CONTROL (TACS 56472 AND 56473)
On April 12, 1988, the NRR staff visited the McGuire Nuclear Station, Units 1 and 2, to review the Groundwater Monitoring and Control System.
The review is associated with a request by the licensee, cated October 31, 1984 and revised January 27, 1988, to change the associated Technical Specification 3/4.7.13 "Groundwater Level" to reflect a revised groundwater level control strategy. provides a summary of this visit.
In support of the licensee's proposed technical specification changes, copies of the existing procedures and draft copies of proposed procedures regarding actions in response to annunciator alarms for increased groundwater levels were provided to the NRC (Enclosure 2).
The staff also received copies of the Problem Investigation Report (Enclosure
- 3) for the January 1988 alert alarm condition for groundwater monitor, MK.GWA-2 located at the exterior of the I. nit 2 Reactor Building, and copies of drawing MC-1220-73 (Enclosure 4) showing details for the exterior groundwater monitors within the underground filtering medium, g foo
~
Darl S. Ho d, Project Manager Project Directorate II-3 Division of Reactor Projects - I/II
Enclosures:
As stated CC:
See next page
4 Duke Power Company McGuire Nuclear Station cc:
Mr. A.V. Carr, Esq.
Dr. John M. Barry Duke Power Company Department of Environmental Health P. O. Box 33189 Mecklenburg County 422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 County Manager of Mecklenburg County Mr. Dayne H. Brown, Chief 720 East Fourth Street Radiation Protection Branch Charlotte, North Carolina 28202 Division of Facility Services Department of Human Resources 701 Barbour Drive Mr. Robert Gill Raleigh, North Carolina 27603-2008 Duke Power Company Nucitar Production Department Mr. H. B. Tucker P. O. Box 33189 Nuclear Production Department Charlotte, North Carolina 28242 Duke Power Company 422 South Church Street J. Michael McGarry, III, Esq.
Charlotte, North Carolina 28242 Bishop, Liberman, Cook, Purcell and Reynolds 1200 Seventeenth Street, N.W.
Washington, D. C.
20036 Senior Resident Inspector c/o U.S. Nuclear Regulatory Commission Route 4, Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 S. S. Kilborn Area Manager, Mid-South Area ESSD Projects Westinghouse Electric Corporation MNC West Tower - Bay 239 P. O. Box 355 Pittsturgh, Pennsylvania 15230
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DISTRIBUTION:FOR MEETING SLHMARY DATED: May 26, 1988 Facility: McGuire Nuclear Station, Units 1 and 2*
tDockettile$
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'NRC'PDR Local PDR PDII-3 Reading D. Matthews M. Rood D. Hood OGC-WF 158-18 E. Jordan MNBB-3302 J. Partlow 9A-2 ACRS(10)
- Copies sent persons on facility service list l
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ENCLOSURE 1
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UNITED STATES 8"
~g NUCLEAR REGULATORY COMMISSION l
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May 6; 1988 Docket No. 50-369/370 MEMORANDUM FOR:
Goutam Bagchi, Chief Structural and Geosciences Branch Division of Engineering and Systems Technology THRU:
Leon Reiter, Section Chief Geosciences Section, Structural and Geosciences Branch Division of Engineering and Systems Technology FROM:
Gary B. Stalcy, Hydraulic Engineer Sai P. Chan, Civil Engineer Geosciences Section, Structural and Geosciences Branch Division of Engineering and Systems Technology
SUBJECT:
SITE VISIT TO MCGUIRE NUCLEAR STATION AND MEETING WITH DUKE POWER COMPANY REGARDING THE TECHNICAL SPECIFICATION FOR THE PERMANENT DEWATERING SYSTEM Messers Gary Staley (Hydraulic Engineer), Sai Chan (Civil Engineer) and Darl Hood (McGuire Project Manager) arrived at the McGuire site on the morning of April 12, 1988. We met briafly with Bill Orders, the resident inspector, and then completed our site access processing. We were joined by SteveLeroyandDavid)ohnsonofDukePowerCo.foratourofthemonitoring wells, gages and the Auxiliary Building which was the subject for the structural review. We also looked at one of the Auxiliary Building sumps where the ground-water is collected and pumped to either the yard drain system or the Turbine Building sumps. We met briefly at the end of the day to review th'e following day's items for discussion.
On Wednesday April 13th we met with Steve Leroy, David Johnson and Bob Dulin at the Duke Power Co. headquarters offices in Charlotte, N.C.
We initially discussed Duke Power's proposed modification to Technical Specification 3/4.7.13, Groundwater Level. This modification reduces the number of monitors from eleven to the five that surround the north end of the Auxiliary Building.
The six deleted monitors would be retained in the plant operating procedures.
Plant shutdown would be required when 3 of the 5 monitors exceed elevation 731 ft, msl rather than the previous requirement for shutdown when one of the monitors exceeded the alann level.
The staff has some reservations on deleting six of the monitors from the specification since the auxiliary purpose of these monitors is to provide early warning of underdrain system malfunction and/or early indications of other than the normal source of water into the system.
We talked to one of the plant instrument technicians by conference call and he explained the operstion of the gage systems for the exterior and interior monitors.
We also discussed the fact that the interior monitors are set at least 2 feet above the nonnal controlled groundwater level and therefore do not have a positive reading which would serve os a check and verification that the equipment is working properly.
They couldn't refute this logic and also couldn't provide any annual test procedure that would provide assurances that the pipe through the wall was not blocked.
Their test procedures only apply to the interior gages and ser.'. ors.
(Tusnu g er-
. They did state that they thought that one or more of these intarior monitors had alarmed on more than one occasion.
It is the staff's opinion that these monitors shouldn't alarm unless the underdrain system is malfunctioning since most of the surface area between the Auxillary Building and Lake Norman is paved, which will preclude significant direct infiltration into the groundwater system, and the underdrain system theoretically should be able to accommodate moderate amounts of surface infiltration without exceeding the monitor alarm levels. The quality of the groundwater monitoring system and its operation will need further review before making a decision on the requested Technical Specification change.
Sai Chan reviewed the structural evaluations pertinent to the uplift, overturning, and stability of the Reactor, Diesel and Auxiliary Buildings in the presence of high groundwater levels.
The licensee's analyses were apparently conservative with respec-t sto building weight since they did not consider the weight of piping and equipmerit.
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,W A CYe Sai P. Chan, Civil Engineer Geosciences Section Structural and Geosciences Branch Division of Engineering and Systems Technology cc:
J. Richardson D. Hood 1
Nc 3'j!; E_ :0;!.I ANCE i3F OUF TE. 27? '000 _i_?
yr !?.55 i. : 5-atex r vown ccnrfs.yy ENCLOSURE 2 r.;.00181 (c.-St!
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Mc it.i:: E_C C tG I ANC E 0: 0!.if TEL: 175-J600-;?:?
Apr 13 i: 10:50 te:.:.
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OP/1/A/6100/10I
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OUKE POWER COMPANY McGUIRE NUCLEAR STATION ANNUNCIATOR RESPONSE FOR PANEL 1AO-8 1,0 Purpose The purpose of this procedure is to give the setpoint, origin, probable cause and actions necessary for identifying and clearing alarms received.
2.0 Limits and Precautions 2.1 All information and indications shall be used in responding and correcting an alarm condition.
3.0 Procedure 3.1 Annunciator Panel 1AD-8 Alarms.
\\
tK'3OIFE COMFLI6NCE CF00F TEL. 3 7 5- 0000- 2 E "; 5 Spr 15,i: D:4: 5 0 N o, c,o,. ;
PANEL 1A08 - E1 GR6UNDWATER ALERf
]
Setpoint:
1WZLS-5060 Unit 1 Reactor Bldg Outside Wall (725' Elev) 1WZLS-5070 Aux Bldg Westside Outside Wall (716' Elev) 1WZPS-5080 Diesel Rm IB Internal Wall (738' 6" Elev)
IWZPS-5090 Diesel Rm 1A Internal Wall (738' 6" Elev) 1WZPS-5100 Aux Bldg NW Stairwell (718' Elev)
OWZPS-5110 Recycle Evaporator Feed Room (718' Elev)
Origin:
Groundwater Monitor Panel Alert is set for 2 feet above floor of instrument.
Probable Cause:
Heavy rain.
Automatic Action:
None immediate Action:
Dispatch an operator to check the Groundwater Honitor Panel to determine the station in alarm.
. =..
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M:Gt.i:F Ei:Gli? LI AtKE OF-0VF TEL: iTE-J000-2513 Apr 13.
10: ' k:....:
i PANEL 1A08 - El Supplementary Action:
1.
With alarm in, refer to Tech Spec 3.7.13 to determine the correct action to take.
When alarm clears, refer to Tech Spec Surveillance Requirement 4.7.13(b) and verify by recording level in the R0 Logbook.
2.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction, contact I&E.
References:
Mschanical Instrumentation and Control List.
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~ McGUIRE_COH. IMICE GPGU: TE_: ;75-2:00-25;?
Apr 13.fi 10:50 No
,:e PANEL LA08 E2 GROUN0 WATER HI LEVEL
- Setpoint:
1WZLS-5060 Unit 1 Reactor Bldg Outside Wall (730' Elev) 1WZLS-5070 Aux Bldg Westside Outside Jall (721' Elev) 1WZPS-5081 Diesel Rm 18 Internal Wall (741' 6"
)
Elev) 1WZPS-5091 Diesel Rm 1A Internal Wall (741' 6" Elev)
IWZPS-5101 Aux Bldg NW Stairwell (721' Elev) j 0WZPS-5111 Recycle Evaporator Feed Rm (721' Elev)
Origin:
Groundwater Monitor Panel Hi level is set for 5 feet above floor of instrument.
Probable Cause:
Heavy rain.
l Automatic Action:
None Immediate Actio'n:
Dispatch an operator to check the Groundwater Monitor Panel to determine the station in alarm.
t : :-9:F E _e.0HPLI AN.:E.: hour id: S[5-4000-[52E Spr - 13,4i.10 : 5 N0..0 i
PANEL'1A08 E2 Supplementary Action:
1.
RefertoTechSpec3.7.13todeterminethe-correct action to take.
- 2. - Inform Shift Supervisor 3.
If alarm was caused by instrument malfunction, contact I&E,
References:
Mechanical Instrumentation and Control List.
4 1
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td C,U I F E _C OM F L I M ;E C O'.8F TEu; 1T?-4000-25;?
Apr H.:: 10 : ! '. '. : - :.; : - :
PANEL 1A08 - E3 GROUN0 WATER HI-HI LEVEL Setpoint:
1WZLS-5060 Unit 1 Reactor Bldg Outside Wall (740' Elev) 1WZLS-5070 Aux' Bldg Westside Outside Wall (731' Elev)
IWZPS-5082 Diesel Rm 1B Internal Wall (751' 6" Elev) 1WZPS-5092 Diesel -Rm 1A Internal Wall (751' 6" Elev)
IWZPS-5102 Aux Bldg NW Stairwell (731' Elev)
OWZPS-5112 Recycle Evaporator Feed Rm (731' Elev)
Probable Cause:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the Groundwater Monitor Panel to determine the station in alarm.
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MC'3UIF E_C0t1F LI4KE i3F.0Vf TEL: iT Y - J 000 -;!; ? '
-Ape !! ii 10:50 IR.000.;.;'
i PANEL 1A08 - E3 Supplementary Action:
-1.
- Refer to Tech Spec 3.7.13 to determine _the-correct action to take.
2.
. Inform Shift Supervisor 3.
If alarm was caused by ' instrument malfunction, contact I&E..
i
References:
Mechanical Instrumentation and Control List.
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MCGUIF.E_ COMPLIANCE GC.0UP TEL: US-4000-2 23 Apr 13 9? 10:f0 N:.
.4 PANEL 2A08 - El l
GROUN0 WATER ALERT Setpoint:
2WZLS-5060 Unit 2 Reactor Bldg Outside Wall (725' Elev) 2WZLS-5070 Aux Bldg Eastside Outside Wall (716' j
Elev) 2WZPS-5080 Diesel Rm 28 Internal Wall (738'6" Elev) 2WZPS-5090 Dicael Rm 2A Internal Wall (738'6" Elev) 2WZPS-5100 Aux Bldg NE Stairwell (718' Elev)
Origin:
Groundwater Monitor Panel Alert is set for 2 feet above floor of instrument.
Probable Cause:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the groundwater monitor panel to determine the station in alarm.
Supplementary Action:
1.
With alarm in, refer to Tech $pec 3.7.13 to determine the correct action to take. When I
alarm clears, refer to Tech Spec Surveillance Requirement 4.7.13(b) and verify by recording level in the R0 Logbook.
C.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction,,
contact I&E,
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tiCGUIFE_COMPLIAt4CE GROUF TEL: 375-J000-li;I Apr 15.ii 1.< : f.:
AAN$L 2A08 - El
References:
Mechanical Ins.rumentation and Control List.
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MC.3UICE_CCMFLIANCE CROUF TEL: 375-J000-2525 Apr 1 35 10;$i. N: ::4
,M PAN,L 2A08 - E2 GROUN0 WATER HI LEVEL 2WZLS-5060 Unit 2 Reactor Bldg Outside Wall (730' Setpoint:
Elev) 2WZLS-5070 Aux Bldg Eastside Outside Wall (721' Elev) 2WZPS-5081 Diesel Rm 2B Internal Wall (741'6" Elev) 1WZPS-5091 Diesel Am 2A Internal Wall (74186" Elev) 2WZPS-5101 Aux Bldg E Stairwell (721' Elev)
Origin:
Groundwater Monitor Panel Hi Level is set for S feet above floor of instrument, i
Probable Cause:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the groundwater monitor panel to determine the station in alarm.
l Supplementary Action:
1.
Refer to Tech Spec 3.7.13 to determine the correct action to take.
2.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction, contact I&E.
References:
Mechanical Instrumentation and Control List.
MC'3 U I F:E _COMFL I At4CE C-F.CUF TEL: 375 1000-;52!-
Apr li. H 10 : i.,
t,..
I MitL L Louv 69 GROUNDWATER HI-HI LEVEL 2WZLS-5060 Unit 2 Reactor B1dg Outside Wall (740' Setpoint:
Elev) 2WZLS-5070 Aux B1dg Eastside Outside Wall (731' Elev) 2WZPS-5082 Diesel Rm 2B Intr.rnal Wall (751'6" Elev) 2WZPS-5092 Diesel Rm 2A Internal Wall (751'6" Elev) 2WZPS-5102 Aux Bldg NE Stairwell (731' Elev)
Origin:
Groundwater Monitor Panel Hi-Hi Level is set for 15 feet above floor of instrument.
Probable cause:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the groundwater monitor panel to determine the station in alarm.
Supplementary Action:
1.
Refer to lech Spec 3.7.13 to determine the correct action to take.
2.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction, contact I&E.
1 Mechanical Instrumentation and Control List.
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MNUIFE.dOrdLIdNCEC4.0VP TEL: 575-4000-2523 Apr 13.H 10:50 No.M4 :.1:
~~~
PANEL 1A08 E1 Change No.
Page 2 of 7 GROUN0 WATER ALERT Setpoint:
2 feet above floor of instrument l
Origin:
1WZLS-5060 Unit 1 Reactor B1dg Outside Wall (Inaccessible, Elev 725')
- 1WZLS-5070 Aux B1dg West side Outside Wall (Inaccessible, Eley 716')
1WZPS-5080 Ofesel Rm IB Internal Wall (Accessible, AA-40 Elev 736')
1WZPS-5090 Diesel Rm 1A Internal Wall (Accessible, 00-42, Elev 736')
- 1WZPS-5100 Aux B1dg NW Stairwell (Accessible, PP-51, Elev 716')
- OWZPS-5110 Recycle Evaporator Feed Rm (Inaccessible,QQ-56,Elev716')
Technical Specification Groundwater Monitor Probable Cause:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the Groundwater Monitor Panel to determine the station (s) in alarm.
(There are 11 Groundwater Monitors in all.
Unit i utilizes 6 of these 11).
1
MCGUIRY~dGEL: 50:E GROUP TEL: 17;'4000-1523 cpr 13 55 '0:50 No,0.:
- .N PANEL 3A08 - E1 Change No.
Page 3 of 7 Supplementary Action:
1.
Refer to Tech Spec Table 3.7-7 Groundwater Level Monitors.
If three (3) out of the five (5) monitors are in alarm (including Unit 2),
contact Duke Design Engineering (Civil) for investigation and resolution of the increased groundwater level.
2.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction, contact !&E.
References:
Mechanical Instrumentation and Control List.
i 1
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NCGUIFE_ COMPLIANCE GROUP TEL: 375-4000-152T Apr 13. H 10 :50 NO. 'N
. li PANEL 1A08 - E2 Change fio.
Page 4 of 7 GROUNOWATER HI LEVEL Setpoint:
5 feet above floor of instrument Origin:
1WZLS-5060 Unit 1 Reactor B1dg Outside Wall (Inaccessible,Elev725')
- IW2LS-5070 Aux Bldg West side Outside Wall (Inaccessible Elev 716')
1WZPS-5081 Otesel Rm IB Internal Wall (Accessible, AA-40, Elev 736')
IWZPS-5091 Diesel Rm 1A Internal Wall (Accessible.
00-42, Elev 736')
- 1WZPS-5101 Aux Bldg NW Stairwell (Accessible, PP-51 Elev 716')
- OWZPS-5111 Recycle Evaporator Feed Rm (Inaccessible, QQ-56, Elev 716')
i Technical Specification Groundwater Monitor Probable Cause:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the Groundwater Monitor Panel to determine the station (s) in alartu.
(There are 11 Groundwater monitors in all, Unit I utilites 6 of these 11).
i I
McGUIF.E.:0:iF L! ANG E0VP TEL : 575-2000-252?
Apr 13.H 10:50 M.000
. 1.;
PANEL *.A08 - E2 Change io.
Page 5 )f 7 Supplementary Action:
1.
Refer to Tech Spec Table 3.7-7 Groundwater level Monitors.
If three (3) out of the five (S) monitors are in alarm (including Unit 2),
contact Duke Design Engineering (Civil) for investigation and resolution of the increased groundwater level.
2.
Inform Shift Supervisor 3.
If alarm was caused by instrument malfunction, contact I&E.
References:
Mechanical Instrumentation and Control List.
i
MCGU s:E.CCMFLI AN E GF0VF TEL. 575-4000-2523-Apr 13 55 10:!0 N1:.0; 7,;.
PANEL 1A08 - E3 Change No.
Page 6 of 7 GROUN0 WATER HI-HI LEVEL Setpoint:
15 feet above floor of instrument Origin:
1WZLS-5060 Unit 1 Reactor Bldg Outside Wall (Inaccessible, Elev 725')
- 1WILS-5070 Aux Bldg West side Outside Wall (Inaccessible,Elev716')
1WZPS-5082 Ofesel Rm 18 Internal Wall (Accessible, AA-40 Elev 736')
1WZPS-5092 0?esel Rm 1A Internal Wall (Accessible. 00-42 Elev 736')
- 1WZPS-5102 Aux Bldg NW Stairwell (Accessible, PP-51, Elev 716')
- OWZPS-5112 Recycle Evaporator Feed Rm (Inaccessible,QQ-56,Elev716')
Technical Specification Groundwater Monitor Probable Cause:
Heavy rain.
)
Automatic Action:
None 4
Immediate Action:
Dispatch an operator to check the Groundwater Monitor Panel to determine the station (s) in alarm.
(There are 11 Groundwater monitors in all.
Unit 1 utilizes 6 of these 11).
1
MC3VIPE.COM.LIf,NCE GROUT TEL: 375.1000-252?-
Apr !!. f i. 10 : 5 0 tic, Oi.~.: f,;;
t 4
PANEL 1A08 - E3 Change No.
Page 7 of 7 Supplementary Action:
1.
Refer to Tech Spec 3.7.13 to determine the
. correct action to take.
+
i 2.
Inform Shift Supervisor 3.
If alarm was caused by instrument malfunction, contact I&E.
i
?
References:
Mechanical Instrumentation and Control List.
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M.3bbi_Todt:5EEGROUPTEL: 375-2000- f:!3 Apr 13.H 1c :50 N;. ::: : ;?
PANEL 2A08
- El Change No.
Page 2 o' 7 GROUN0 WATER.*,'. !RT Setpoint:
2' Above Floor of Instrument Origin:
2WZLS-5060 Unit 2 Reactor 81dg Outside Wall (Inaccessible, Elev 725')
- 2WZLS-5070 Aux Bldg Eastside outside Wall (Inaccessible, Elev 729')
25:h'. 3080 Diesel Rs 2B Internal Wall (Accessible, E9 !?, llev 736')
2WtPs 5090 Diesel Rm 2A Internal Wall (Accessible, 00-69, Elev 736')
- 2WZPS-5100 Aux Bldg NE Stairwell (Accessible, PP-61, Elev 716')
Technical Specification Groundwater Monitor
~
Probable Cauto:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the Groundwater j
Monitor Panel to determine the station (s) in alarm.
(There are 11 Groundwater monitors in all.
Unit 2 utilizes 5 of these 11).
i 1
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1 MCGUIRE_ COMPLIANCE GROUP TEL: 375-4000-25 ?
Apr 1?.ii l' : 50 M. 32 :, _2 PANEL 2A08 - El Change No.
Page 3 of 7 Supplementary Action:
1.
Refer to Tech Spec Table 3.7-7 Groundwater Level Monitors.
If three (3) out of the five (5) monitors are in alarm (including Unit 1),
contact Duke Design Engineering (Civil) for investigation and resolution of the increased groundwater level.
2.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction,-
contact I&E.
References:
Mechanical Instrumentation and Control List.
5 O
n_ _ _ _ _ _ _ _ _ _. _ __ _ _ _ _ _ _ _ _
rddVIdi_~C0dLIdNCE C-RGUP TEL:.R75-2000-2523 Apr ;9,H 10:50 No, ^J I,25 PANEL 2AD8 - E2 Change No.
Page 4 of 7 GROUNOWATER HI LEVEL Setpoint:
5 Feet Above Floor of Instrument Origin:
2WZLS-5060 Unit 2 Reactor Bldg Outside Wall (Inaccessible, Elev 725')
- 2WZLS-5070 Aux Bldg Eastside outside Wall (Inaccessible,Elev729')
2WZPS-5081 Diesel Rm 2B Internal Wall (Accessible, 88-72, Elev 736')
IWZPS-5091 Diesel Rm 2A Internal Wall (Accessible, 00-69, Elev 736')
- 2WZPS-5101 Aux Bldg E Stairwell (Accessible.
PP-61, Elev 716')
Technical Specification Groundwater Monitor Probable Cause:
Heavy rain.
Automatic Action:
None Irtmediate Action:
Dispatch an operator to check the Groundwater Monitor Panel to determine the station (s) in alarm.
(There are 11 Groundwater monitors in all.
Unit 2
~
utilizes 5 of these 11).
i
MCiUIFE COMPLIGlCE GF.0VF TEL: 375-0000-2523 Apr 15. p 10. 0 N.:. 0 c. :, ;.i PANEL 2A08 - E2 Change No.
Page 5 of 7 Supplementary Action:
1.
Refer to Tech Spec Table 3.7-7 Groundwater Level Monitors.
If three (3) out of the five (5) monitors are in alarm (including Unit 1),
contact Duke Design Engineering (Civil) for investigation and resolution of the increased groundwater level.
2.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction, contact I&E.
References:
Mechanical Instrumentation and Control List.
1
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4-ia-se;ii:o) AM; 875 4000 2523 +
3738033 ; v2-
' MCOUIFE_CCMFLIANCE GROUP TEL: 375-4000-;E23 Apr 13 55 10:50 No.004 ;.27 PANEL 2A08 - E3 Change No.
Page 6 of 7 i
i GROUN0 WATER HI-HI LEVEL 1
i Setpoint:
15 Feet Above Floor of Instrument Origin:
2WZLS-5060 Unit 2 Reactor Bldg Outside Wall (Inaccessible, Elev 725')
- 2WZLS-5070 Aux Bldg Eastside Outside Wall (Inaccessible, Elev 729')
2WZPS-5082 Diesel Rm 28 Internal Wall (Accessible, 88-72, Elev 736')
2WZPS-5092 Diesel Rm 2A Internal Wall (Accessible, 00-69, Elev 736')
- 2WZPS-5102 Aux Bldg NE Stairwell (Accessible, PP-61, Elev 716')
Technical Specification Groundwater Monitor Probable cause:
Heavy rain.
Automatic Action:
None Immediate Action:
Dispatch an operator to check the Groundwater Monitor Panel to determine the station (s) in alarm.
(There are 11 Groundwater monitors in all.
Unit 2 utilizes 5 of these 11).
...:.l.
- ... J T..,v L. :-.".
~
PANEL 2A08 - E3
-Change No.
Page 7 of 7 Supplementary Action:
1.
Refer to Tech. Spec 3.7.13 to determine the correct action to take.
2.
Inform Shift Supervisor.
3.
If alarm was caused by instrument malfunction, contact I&E.
References:
Mechanical Instrumentation and Control List.
i i
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January 21, 1988 T. L. McConnell, Station Manager McGuire Nuclear Station Re: McGuire Nuclear Station Unit 2 Reactor Building Exterior Groundwater Monitor Follow-up to Handwritten letter of January 19, 1988 File No.:
MC-1124.07 The Civil Support Section (CSPH) has been informed that the alam for the exterier groundwater monitor (Mk.GWA-2) adjacent to the Unit 2 Reactor Building has been activated.
There are three (3) alarm levels on this monitor - at elevations 725+0, 730+0, and 740+0.
The alarm at elevation 725+0 was activated.
This groundwater monitor has alamed several times in the past year.
On these sa 4 occasions, an acjacent Auxiliary Building groundwater monitor (1xsted at Col. lines pP-61) with an initial alam level of El. 718+8, has not alarined.
This occurrence leads us to believe that the subject groundwater monitor and associated well are maifunctioning.
In the event that the subject alamed monitor is a true indication of the groundwater level, the higher groundwater levels against the Reactor Building walls will not present a problem since these walls are designed for ground-water levels up to El. 750+0, McGuire calculation MCC 1134.03-00-0003 contains the Reactor Building Shell Wall design.
The present McGuire Technical Specification for Groundwater Level (3/4.7.13) requires Plant Shutdown if the groundwater level cannot be reduced to below the adjacent floor slab elevation (El. 72540 for the subject Reactor 81dg.
monitor) within seven (7) days.
In crder to avoid an unnecessary Plant Shutdown, the Civil Support Section (CSPH) recommends that the subject monitor be deleted from the current McGuire Technical Specification.
The remaining monitors in the McGuire Technical Specification will be sufficient to indicate an increase in groundwater.
It should be noted that a proposed revision to the McGuire Technical 3pec-ification for Groundwater Level is currently being finalized by the Licensing Group in the Nuclear Production Department.
This proposed revision will delete the subject monitor from the Technical Specification, sinca the Reactor Builcing is specifically designed for a maximum groundwater level of 750+0 in combination with other loading conditions, s
l McGuire Nuclear Station Unit 2 Reactor Building January 21, 1988 Page 2 If there are any questions, please contact David B. Johnson at extension 3-7167.
S. B. Hager, Chief Engineer l
Civil /Enytronmental Division j
By:
D. L. Rehn Principal Engineer 1
08J/cnm cc:
N. A. Rutherford Central Records 1
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PROBLEM INVESTIGATION REPORT
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SR } MJj e MC l ATTACHMENT 1 preposed Resolution of problem On January 19, 1988, the Civil Engineering Section, CENS (formerly the Civil Support Section, CSEH) was informed that the first alarm (the ' Alert" alarm at Ele.ation 725+0) for groundwater monitor MK.GWA-2 had been activated.
Ints same menitor has alarved several times in the past year.
On these same occasions, an adjacent Auxiliary Building groundwater monitor (located at Column Lt.9ss p3-51) with an initial alarm level of Cl. 718+8 has not alarmed.
This ceescrence leads us to believe tnat the subject monitor is not reflecting a crue indication of the groundwater levels in this area.
Although, we cannot be sure what is causing the "Alert" alarm to activate, we will make the following hypotheses:
'he original Unit 2 Reacter Building Tower Crane Base is located in close proximity to the subject groundwater monitor (see Attachment 2).
This base consists of a 23' x 23' x 10' deep reinforced concrete slab with the top of che slab being at approximately Elevation 744+0.
The bottom section of the crane was embedded in the slab as shown on construction drawing No, McFO-43 (see attachment 3 and 4).
A corrugated metal pipe, approximately la feet in diameter, was placed around the bottom portion of the crane tower and extended from the base to several feet above the base (see Attachment 5).
This pipe served as a barrier for the tower crans against soil and groundwater while fill material was being placed and compacted in the area e
around the crane base.
10F 3
Pm 2 Msg-ccc7 ATTACHMENT 1 l
After the completion of the Unit 2 Reactor Building, the Tower Crsno was torched off near tne base.
It is reasonable to assume that some portion of the corrugated pipe was left intact and nas filled in with "fill" natorial.
This man-made "basin" would help explain the alarming of Groundwater Monitor MK.GWA-2.
The crane base and associated corrugated pipe probably collect rainwater.
This water could eventually migrate to the nearby groundwater monitor and enter the groundwater well, with the result being an activation of the alarm fcr this monitor.
This type of scenario would obviously not reflect a true indication of the groundwater levels in the area.
I1 addition, the Tcner Crane Base may be a source of disruption for :ne
- oned Wall Filter, which extends around the Reactor Building betneen the east side of the Unit 2 Auxiliary Building wall and the Unit 2 Outside Doghouse. The Zoned Wall Filter drains the surrounding groundwater levels down 5 the Underdrain System, which eventually collects tne water into three sumps contained in the Auxiliary Building.
Any disrupt on of the i
Zoned Wall Filtar could affect the flow of the groundwater to the Underdrain System, possibly causing a buildup of water around the disrupted Zoned Wall Filter (or crane base).
In our specific case, it is evident that the crane base at least partially penetrates the Zoned Wall Filter.
As noted in the letter of January 21, 1988 from D. L. Rehn to T. L. McConnell, a Geopcsed revision to the McGuire Technical specification for Groundwater Level 2 0F 3
in 2 yJ! -n
~
ATTACHMENT 1 is :rrently being finalized by tne Licensing Group in the Nuclear Dreduction Department.
This proposed revision will delete the subject monitor fecm the Technical Specification, since the Reactor Building is specifically designed for a,aximum groundwa:er level of 750+0 in ecmoination witn the loading condittons.
In the above referenced letter, the Civil Engineering Section (CENB) recomended that the subject monitor be deleted from the current SCGuire Technical Specification.
Tnis esccmendation was made in order to avoid an unnecessary plant snutdown, which is called for in the present McGuire Technical Soecification if two groundwater level cannot be reduced to below the alarm level within seven days.
)
Although the Civil Engineering Section does not believe that the alarmed groundwater monitor presents a significant problem, the following steps couid be taken to further investigate the groundwater in this ar9a.
1)
Water samples could be taken frem the subject well.
These samples could be analyzed by the Chemistry Group at the site to determine the contents of the water.
2)
Aoditional wells could be drilled in the vicinity of Grouncwater Monitor MK.GWA-2 to better determine what the true groundwater levels are in this area.
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