ML20083B980

Forwards Rev 3 to Relief Request GPRR-2 Which Requested Relief from Requirements of Section XI of ASME & B&PV Code Concerning Accuracy of Pump Instrumentation.Submits Info Inadvertently Omitted from Rev 2

ML20083B980
Person / Time
Site:	Limerick
Issue date:	05/04/1995
From:	Hunger J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9505150041
Download: ML20083B980 (6)

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PECO ENERGY Nuclear Group Headquarters MS Chesterbrook Boulevard Wayne. PA 190874 691 May 4,1995 Docket Nos. 50-352 t 50-353 License Nos. NPF-39 NPF-85 1

U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

Subject:

Limerick Generating Station, Units 1 and 2 Revision to Relief Request for the First Ten Year interval Pump and Valve inservice Testing Program Gentlemen.

Attached is a revision to Relief Request No. GPRR-2 (i.e., Revision 3) for the Limerick Generating Statix (LGS), Units 1 and 2, First Ten Year Interval Pump and Valve Inservice Testing (IST)

Progre.m. This Relief Request was originally submitted as part of the original IST Program submitted to the NRC for review and approval by letter dated November 23,1988. ' Relief Request No. GPRR-2 requentari relief from the requirements of Section XI of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code concoming the accuracy of pump instrumentation installed in various plant systems at LGS, Units 1 and 2.

By letter dated March 5,1991, the NRC lasued its Safety Evaluation Report (SER) and supporting Technical Evaluation Report (TER) for the LGS, Units 1 and 2 First Ten Year Interval IST Program. As documented in its SER and TER, the NRC identified concems with this Relief Request and only granted relief for certain pump instrumentation provided the inaccuracy of the instrumentation did not exceed *6%. The NRC requested that we revise this Relief Request to address the concems identified in its SER and supporting TER. Relief Request No. GPRR-2 was revised to address these issues and was resubmitted for review and approval by letter dated May 1,1992. The NRC subsequently approved the revised Relief Request (i.e., Revision 1), as documented in a letter dated February 17,1993, provWed that the Relief Request be updated further to include some of the supplemental information that was contained in our letter dated -

May 1,1992. Relief Request No. GPRR-2 was again revised (i.e., Revision 2) to incorporate the information requested by the NRC.

Howevoi, we have recently determined that some of the information that should have been included in the last revision of this Relief Request (i.e., Revision 2) was inadvertently omitted.

Specifically, the instrumentation associated with the Main Control Room Chilled Water System 120028 9505150041 950504

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pumps were not included in the table identifying the affected plant systems pertinent to this ,

Relief Request. Therefore, we are revising Relief Request No. GPRR-2 to include the missing i

i. : information in the table. A vertical bar in the right margin of the page identifies the information i

' that was added. This revision to Relief Request No. GPRR-2 does not alter any of the Information or deviste from the technical basis previously used by the NRC in approving this .,

L Relief Request.  ;

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If you have any questions or require additional information, please do not hesitate to oontact us.

Very truly you s, G. A. Hunger, Jr. ( j Director - Licensing Attachment i

cc: T. T. Martin, Administrator, USNRC, Region I (w/ attachment) l N. S. Perry, USNRC Senior Resident inspector, LGS (w/ attachment)  ;

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i Limerick Generating Station  :'

Units 1 and 2 First Ten-Year interval inservice Testing Program RELIEF REQUEST NO. GPRR-2, Revision 3 1

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LGS, Units 1 and 2 Docket Nos. 50452/50-353 IST Program Page 1 of 3 REUEF REQUEST NO. GPRR-2 Revision 3 ,

Pump (s): Main Control Room OAP162 Chlied Water OBP162 Residual Heat Removal 0AP506 0CP506 Service Water OBP506 ODP506 Emergency Service Water QAP548 OCP548 I OBPS48 ODP548 Residual Heat Removal 1AP202 2AP202 1BP202 2BP202 1CP202 2BP202 1DP202 2DP202 Reactor Core Isolation Cooling 10P203 2OP203 l High Pressure Coolant injection 10P204 20P204 Testing Requirement (s):

Pump instrumentation accuracy and full-scale range shall be within the limits specified in ASME Section XI Subsection lWP Articles IWP 4110 and IWP-4120.

Basis for Relief:

Various permanently installed pressure and flow instruments are calibrated to an accuracy that exceeds 2% of full-scale or have a full-scale range that exceeds the three times the reference value criteria that is specified by the Code Although these instruments do not meet the Code requirements, they are able to provide the same c-better indication accuracy at the reference value that is allowed by the Code.

For instruments to be in compliance with ASME Section XI Subsection IWP, two requirements must be satisfied. The first requirement (specified in IWP-4110, Table IWP-4110-1) states that flow and pressure instrumentation must be accurate to within

• 2% of the full-scale value; the second requirement (specified in IWP-4120) states that "the full-scale range of each instrument shall be three times the reference value or less." Based on these requirements, a maximum indication accuracy of e6% c.an be calculated by comparing the actual tolerance of the instrument to the reference value being measured. An example of calculating the indicated accuracy is shown below.

Example Using a flow reference value of 10,000 gpm and a flow gauge with an actual full-scale range of 12,000 gpm that is calibrated to *2% of full-scale:

' LGS, Units 1 and 2 Docket Nos. 50-352/50-353 IST Program Page 2 of 3 RELIEF REQUEST NO. GPRR-2 Revision 3 (cont'd)

Code Reauirement Reference value = 10,000 gpm l IWP-4120,3 x reference value = 30,000 gpm Instrument tolerance = $000 gpm (i2% x 30,000 gpm)

Indicated accuracy

~i600 gpm /10,000 gpm x 100% = *6%

The indicated accuracy for the instruments on the pumps listed are less than or equal to iS% at the reference value. These accuracles are the same or better than allowed by the Code.

The following table specifies the instruments where this relief request applies. The j indicated accuracy, which is less than 6% in all cases, is determined by dividing the actual instrument tolerance by the reference value multiplied by 100%.

Key to systems and instruments 011 Emergency Service Water 1 012 Residual Heat Removal Service Water 049 Reactor Core isolation Cooling 051 Residual Heat Removal 055 High Pressure Coolant injection 090 Main Control Room Chilled Water Fl F;ow Indicator (gpm) )

P! Pressure indicator (psig) ]

LGS, Units 1 cnd 2 '

Docket Nos. 50-352/50-353 IST Program Page 3 of 3 REUEF REQUEST NO. GPRR-2 Revision 3 (cont'd)

SYSTEMS MSTRUMENT REFERENCE NSTRUMENT NSTRUMENT NSTRUMENT NDICATED NUMBER VALUE RANGE ACCURACY TOLERANCE ACCURACY 011 FLOW E1517 3,400 0 - 12,000 1At% 181.2 5.33%

011 FLOW E1547 3,400 0 - 12,000 1A1% 181 2 5.33%

011 FLOW E2517 3,400 0 - 12,000 1A1% 181 2 5.33%

011 FLOW E2517 3,400 0 - 12,000 1Al% 181.2 5.33%

012 R41-1Ful02A 9,000 0 - 12,000 3.20% 384 4.27 %

012 R41-1741028 9,000 0 -12,000 320% 384 4 27 %

012 R61-2ROO2A 9,000 0 -12,000 3.20% 384 4.27%

012 R41-2RB02B 9,000 0 -12,000 3.20% 384 4.27%

040 R-40-1RD00-1 570 0 - 700 3.08% 21.56 3.78% j 049 FMG4R100-1 650 0 -700 3.08% 21.56 3.32%

051 R41-1RB03A 10,000 0 - 12,000 3.20% 384 3A4%

051 R611F4103B 10,000 0 - 12,000 3.20% 384 3A4%

051 R61-1RBCDC 10,000 0 - 12,000 3.2D% 384 3A4%

051 R41-1R8030 10,000 0 - 12,000 3.20 % 384 3A4%

051 R61-2R803A 10,000 0 - 12,000 3.20% 384 3A4%

051 R41-2RB038 10,000 0 - 12,000 3.20 % 384 334%

051 R412RB03C 10,000 0 - 12,000 3.20 % 384 334%

051 R41-2RB33D 10,000 0 -12,000 3.20 % 384 3.84 %

055 F1551R8001 5,000 0 - 6,000 3.08% 184A 3.30% )

055 R65-2RB00-1 5,300 0 - 6,000 3.08% 184A 3.40%

055 M45-1RB01 880 0 - 1,500 3.05% 45.75 5.32%

055 phi 52RB01 880 0 1,500 3.05% 45.75 5.32%

000 FH10434A 800 0 - 800 3.12% 24.96 4.16 %

000 FH140348 000 0 - 800 3.12% 24.98 4.16 %

l Alternate Testing:

The existing permanently installed pump instrumentation is acceptable provided the indicated accuracy is less than or equal to *6% of the reference value. No alternate testing will be performed.

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