ML20091K696

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Proposed Tech Specs Correcting Typos in Measurement Range for Seismic Monitor,Including Separate Ranges for Various Instruments Changing Measurement Range of Triaxial Peak Accelerograph-2XR-8347
ML20091K696
Person / Time
Site: Arkansas Nuclear  Entergy icon.png
Issue date: 01/21/1992
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20091K685 List:
References
NUDOCS 9201270034
Download: ML20091K696 (9)
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i ENCLOSURE PROPOSED TECHNICAL SPECIFICATION AND RESPECTIVE SAFETY ANALYSES l 1

1 IN THE MATTER OF AMENDING

-LICENSE NOS DPR-51 AND NFP-6  !

ENTERGY OPERATIONS, INC.

ARKANSAS' NUCLEAR ONE, UNITS ONE AND TWO DOCKET N0s, 50-313 AND 50-368 e

9201270034 920121 PDR ADOCK 05000313

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DESCRIPTION OF PROPOSED CilA "

i The ANO-1 proposed change re . ;es Speci fication 3. 5.1.13 to include separate measurement ranges for the Triaxial Time-liistory Accelerographs (0.01-1.0g),

the Triaxial Peak Accelerographs (0.05-1.0g), and for the Triaxial Response Spectrum Recorders (2-25.4 liz ) . Additionally, Channel Description 42.b.1 in Table 4.1-1 is revised to provide the correct component nomenclature 2XR-8347.

The ANO-2 proposed change af fects TS Table 3 3-7 of Specification 3/4.3.3.3.

Table 3.3-7 Item 2.a. " Triaxial Peak Accelerograph - 2XR-8347 Containment Base Slab. Elev. 336'6"," currently has a stated Measurement Range of "0.01-1.0g." This Measurement Range is requested to be changed to "0.0"-1.0g," consistent with the measurement range for the other Peak Accelerographs of identical design in this Table.

BACKGROUND In September 1991, a discrepancy concerning the measurement range specified in the ANO-2 TS for Triaxial Peak Accelerograph 2XR-8347, Containment Base Slab, was identified. Specifically the range specified for this instrument in ANO-2 TS Table 3.3-7, Item 2.a. is 0. 01-1. 0g. However, a review of the instrument design and technical documents provides the actual measurement capability as 0.05-1.0g. This range is correctly specified in this TS Table for two other triaxial peak accelerographs (2XR-8348 and 2XR-8349) which are of identical design to the 2XR-8347 instrument of concern.

The resultant investigaticu has shown this to be a typographical error in the TS issued with the original ANO-2 operating license in July 1978. This error has remained undetected until the recent discovery. The measurement range for each of these triaxial peak accelerographs was submitted to the NRC with the initial markup of the CE-STS on March 23, 1976, as 0.05-1.0g. On issuance of the TS with the ANO-2 operating license, the measurement range for 2XR-8347 was listed as 0.01-1.0g. This matched the range for the triaxial time-history accelerographs listed in Table 3.3-7, just above the peak accelerographs, and not the correct range for the specified instrument. No indication of NRC technical disagreement with the initially submitted range has been identified.

The typographical error has gone undetected since that time.

This matter was discussed via phone with the ANO-2 NRR Project Manager on September 30, 1991. In subsequent conversation, after investigation on the part of the NRR project Manager, it was agreed that the intent of the specification was not to require a more sensitive instrument than was originally installed in the plant.

ANO-1 TS 3.5.1.13 contains a description of the minimum measurement range for types of seismic monitoring instrumentation. The " minimum" different measurement range also refers to the same Triaxial Peak Accelerographs as described above for ANO-2. The actual measurement range for these instruments is, as stated above, 0.05-1.0g. Additionally, when these instruments were included (Amendment 135), a typographical error also occurred in specifying the component number for Table 4.1-1 item 42.b.1.

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DISCUSSION = ,

-As: stated ,in the ANO-2 FSAR (section _3. 7. 4.1), the seismic inotrumentation which was-installed at ANO-2 conforms to AEC Regulatory Guide 1.12 dated-March .

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10. 1971 - (also known as " Safety Guide" 1.~ 12 ) . The . NRC staff' concurred and stated'their acceptance in<section 3.7.3 of the ANO-2 SER. The NRC also found these-instruments acceptable in the September- 13 -1990 SER approving these instruments' inclusion in ANO-1 TS Section 3.5.1.

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'In_ summary, the proposed changer are necessary to correct typographical errors and -eliminate potential- misinterpretation of the' requirements.- The result will be Technical Specification. requirements which meet - the original _ intent, are consistent with plant design, and conform to NRC guidance.

' DETERMINATION OF-NO SIGNIFICANT HAZARDS CONSIDERATION An ' evaluation of the proposed changes - has been performed in accordance - with 10CFR50.91(a)(1) _regarding no significant hazards consideration using _- the -

st'andards in 10CFR50 92(c). A discussion _~of those standards as they relate to-this-amendment request iollows: ,

Criterion 1 - Does. Note Involve : A - Significant Increase in the Probability or Consequences _of An_ Accident Previously Evaluated Accident mitigation features of ANO-1 or ANO-2 do : not involve seismic monitoring instrumentation. Furthermore. - this proposed change does not affect the --design ' or operability requirements of - this instrumentation.

--Therefore. this-_ proposed changes-do not involve a significant increase in t M probability.or_ consequences of an accident previously evaluated.

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  • Criterion 2 - Does - Not Create the Possibility of a New or_ Different Kind of Accident ~from Any Previously Evaluated .

.The proposed changes correct an editorial deficiency and does not involve any design changes, plant modifications, changes in acceptance criteria -or-changes in plant operation. Seismic monitoring ' instrumentation - is - not-

Identified as :an : initiator of any event. nor is it identified. as a mitigatoriin any event, and therefore, _ can not create the possibility of a -

-new sor different kindiof __ accident from any previously evaluated.'

-Criterion 3 - Does Not Involve A Significant Reduction in the Margin'of Safety l

~4' -The'_ design, _ function, and operability requirements for the seismic

monitoring : Instrumentation remains unaffected by these proposed changes.

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Additionally, this- instrumentation:does not provide any protective function

- and . is not associated with. any " margin of safety." Therefore, these proposed ' changes " do - not involve- a significant reduction in the mergin of safety.

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The Commission- lias . provided guidanco, in 51 ' FR - 7750 on liarch 6, 1986'- ,

concerning the application of those 10CFR50.92 standards by providing examplos ,

tof . amondments: which aro ~ likely to. involvo no significant hazards considerations.' The proposed amendment most closely matches example B. (1)-

-from this - guidanco: "A purely- administrativo chango-to TS: for- examplo, a change to achiovo consistency throughout the TS, correction of an error, or n

-change in nomenclature."

Thorofore,. based on the reasoning prosented abovo and the'provious discussion '

of the amendment request Entorgy operations, Inc. has dotormined that the requested changes do not involvo a significant hazards consideration.

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ANO-1,TECilNICAL SPECIFICATION PROPOSED CilANGED PAGES 4

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3. 5,- 1.13 - Thn'S$lemic Monitoring Instrumentation shall be operable with a minimum measurement range of 0.01.- 1.0 g : for Trinxial Time - r

-111 story Accelerographs, 0.05 - 1.0 g for Triaxial Peak

~ Accelerographs, and 2-25.4 Itz for Triaxial Responso Spectrum

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- Amendment No. J35, 42b

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Table 4.1-1 (Cont.) - *

-Channel' Description Check Test Calibrato Remarks

-b.- Triaxial Peak Accelerographs

1. 2XR-8347, Unit 2 NA NA R Containment Base Slab, Elev. 336'6"
2. 2XR-8346, Unit 2 NA NA R Primary Shield O/S Reactor Cavity, Elev. 366'3" f 3. 2XR-8349, Unit 2 Tct NA 'NA R
of Containment, Elev. 531'0" L- . .
c. Trinric1 Response-Spectrum Escordera l 1. 'lXR-8350. Unit 2 NA R R Containment, Base' Slab, Elev. 335*6" (OlS Contalnment)
43. ESAS Manual Trip Functions
a. Switches & Logic NA R NA b, Logic NA M NA
44. Reactor Manual Trin NA P NA
45. Reactor Building Sump Level NA NA R
46. EF'4 Flow Indication M NA R Amendment No. 25,59,60,61,91,110,125, 72b o __ - _ - -

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t ANO-2 TECl!NICAT, SPECIFICATION

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' PROPOSED CilANGL PAGES -

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TIADLE 3.3 SEISHIC MONITORING 1NSTRUMENTAT10N

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.HINIMUM MEASUREMENT INSTRUMENT INSTRUMENTS AND SENSOR Is0 CATIONS RANGE _QEERiBLE._

1.- = Triaxial Time-liistory Accelerographs a.- ACS-8001, Unit 1 Containment Dase Slab, Elev.=.335'* ' O.01-1.0g 1

b. ACS-8002, Unit 1 Top of Containment,

.Elev. 531'6" 0.01-1.0g 1

2. - Triaxial Peak Accelerographs
a. 2XR-8347, Containment Base Slab, Elev. 336'6"- 0.05-1.0g 1
b. 2XR-8348, Primary Shield 0/S Reactor . _

Cavity Elev.-366'3" 0.05-1.0g. I c.s 2XR-8349, Top of Containment, Elev.

531'6"- -- 0. 0 5 - 1. 0g 1

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-3.. .Trinxial Rosponse-Spectrum Recorders n- 2XR-8350, Containment Base Slab, 2-25.4 liz 1 Elev, 335'6" (0/S Containment)

  • With Unit'1 control room ^fndication/or alarm 4

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-ARKANSAS.- UNIT-2 3/4 3-31 Amen Iraent No.

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