ML20083C030

GE Numac Leak Detection Sys Seismic Analysis Summary, for DCP 87-0725

ML20083C030
Person / Time
Site:	Perry
Issue date:	04/27/1995
From:	Lawrence L, Thornton J GENERAL ELECTRIC CO.
To:
Shared Package
ML20083C018	List: ML20083C014 ML20083C019 ML20083C030
References
NUDOCS 9505150077
Download: ML20083C030 (4)

Text

-

GE NUMAC LEAK DETECTION SYSTEM SEISMIC ANALYSIS

SUMMARY

i for DCP 87-0725 Prepared By: Larry P. Lawrence / . . ~$ 4/7# /cpf _

~

Reviewed By: Jim Thornton/ d O'\ 4 !Z7f9h Approved By: 7 %d I

/ '

l

$hrl[lN9d 1 9505150077 DR 950505 ADOCK 0500 0

4 . . .__ _ _

l 1.0' PURPOSE l l

The purpose of this report is to summarize the seismic analysis that has been performed to support installation of the Perry Nuclear Power Plant (PNPP) GE NUMAC Leak Detection System (LDS)in Control Room Panels IH13-P632 and 1H13-P642. The following provides a summary of the seismic qualification analysis approach and the conclusions i resulting from the analysis. l

. 2.0 APPROACH The NUMAC LDS equipment being installed in the 1H13-P632 and the IH13-P642 control room panels includes the following safety related items: (i) NUMAC LDS Chassis, (ii) l Thermocouple unit (iii) Relay unit, and (iv) Cables.

l All equipment and panels being modified are safety related Seismic Category I

{

components. Seismic / dynamic qualification must be demonstrated for the NUMAC l installation, since the modifications required for the NUMAC installation alter to some l degree the mass and stiffness characteristics of the panels as well as the stiffness characteristics of the local supports for some of the internal devices. Specifically, dynamic qualification to the PNPP unique seismic input motions were addressed to:

1

1. Assess the impact of the NUMAC related panel modifications on the existing ,

dynamic qualification of the safety related equipment and devices which remain in the modified panels. This was accomplished by modelling, comparing, and analyzing the in-panel Required Response Sp ctra (RRS), at the limiting >

locations, for both the modified and unmodified panel configurations.

2. Demonstrate dynamic qualification of the added NUMAC LDS hardware. This involved the generation of bounding in-panel RRS at the NUMAC devi.pe locations which was compared with the minimum NUMAC RRS in order to .

demonstrate dynamic qualification of the NUMAC LDS equipment.  !

3. Demonstrate the structural integrity of the modified NUMAC Panel, including the ,

NUMAC in-panel structural support framework. This was accomplished by performing a conservative Modified Static Coefiicient analysis of the modified '

panel when subjected to the PNPP seismic input motions.

The above issues are addressed in a PNPP- specific NUMAC dynamic qualification report GE NEDE-32305P, dated December 1993 (Ref. 4.1). ,

in addition to the NUMAC dynamic qualification described above, a seismic hold-down  ;

i l

AASEISMIC.WPD April 25. :095 2 l

l l

l

~.

calculation was performed (Ref. 4.2) to evaluate the NUMAC and Barton meter cover plate mounting bolt requirements in panel IH13-P632. A transition cover plate was not required for the NUMAC installation in 1H13-P642 and thus a hold-down calculation was not required for this panel.  !

3.0 CONCLUSION

The following conclusions are based on the analytical results of the dynamic seismic analysis perfonned for the limiting 1H13-P642 panel and for the NUMAC hold-down '

calculation in Panel 1H13-P632. The rationale leading to these conclusions is briefly stated. More detailed discussions on the methodology and results are provided in References 4.1 and 4.2.

3.1 Impact of Modifications on Existing Dynamic Qualification -

The analysis shows that the modified panel remains rigid with respect to the PNPP l seismic input motion in the front- to-back and vertical directions, and remains approximately rigid in the side-to side direction. Consequently, there is no significant dynamic amplification through the panel, and the in-panel seismic responses remain  ;

essentially identical to those of the corresponding components of the base input j motion to the panel. It is concluded that the panel modifications do not impact the l existing dynamic qualification of all safety related components which remain in the modified panels.

3.2 Dynamic Qualification of Added NUMAC Equipment The added NUMAC equipment is dynamically qualified to the PNPP unique seismic input motion. This follows directly from the fact that the minimum RRS to which the NUMAC equipment have been qualified by dynamic test envelops the corresponding bounding PNPP NUMAC in-panel RRS, with significant margin, throughout the entire frequency range.

l 3.3 Structural Integrity of NUMAC In-panel Support Framework The maximum principal stresses in the NUMAC equipment in-panel support members were well below the material allowable stresses for the lowest grade carbon steel. The supporting members consist of(i) beam elements representing the slide chassis of the NUMAC LDS, (ii) beam elements representing the unistruts on which the thermocouple unit is mounted, and (iii) beam elements representing unistruts on l

AASilSMIC.WPD April 25.1995 3 I

w  :

}' .

i which the relay unit is mounted. I It is therefore concluded that the added in-panel infra-structure which directly supports the NUMAC LDS equipment is structurally adequate for the PNPP seismic - j loads. '

I 3.4 NUMAC Hold-down Calculation H13-P632 i

-(' {

' Die results of the calculation provide three recommendations to ensure that both the i NUMAC cover plate and the hold-down bolt stresses will be below the material j allowables. The following recommendations have been incorporated into the NUMAC structural design; i

I 1

1. The NUMAC and the Barton cover plate hold-down bolts should be 3/8" ,g.{

diameter, A307 bolts with 16 threads per inch or their equivalent. " '

I i

2. The hold-down bolt preload should be at least 50% of the bolt allowable preload.  !

This is required to minimize any vibration and thermal shakedown effects.

3. The NUMAC and the Barton cover plate thickness should be at least equal to the thickness of the panel enclosure; i.e., ty, :t 0.18". 'I

)

Therefore, the NUMAC Seismic / Dynamic Evaluations have demonstrated that the NUMAC LDS is seismically qualified at the point ofinstallation in the PNPP Control Room.

4.0 REFERENCES

4.1 NEDE-32305P," Seismic Evaluation of Control Panel H13-P642 for Leak Detection Monitoring System Upgrade to NUMAC for CEI Co. Perry Nuclear Power Plant,"

dated December 1993.

4.2 General Electric Transmittal from R.L. Mapes, GENE to Ray Tanney, CEl, " Perry 1&2 NUMAC LDS Upgrade Evaluation of NUMAC and Barton Meter Cover Plates and Hold-down Bolts for Control Room Panel H13-P632.

l AASEISMIC.WPD l

April 25.1995 4  !

. , . .-