ML20216E279
| ML20216E279 | |
| Person / Time | |
|---|---|
| Site: | Paducah Gaseous Diffusion Plant |
| Issue date: | 03/09/1998 |
| From: | Toelle S UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | Paperiello C NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| GDP-98-0038, GDP-98-38, NUDOCS 9803180006 | |
| Download: ML20216E279 (9) | |
Text
.
.E USEC o
A Global Energy Company i
March 9,1998 GDP 98-0038 Dr. Carl J. Paperiello Director, Office of Nuclear Material Safety and Safeguards Attention: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Paducah Gaseous Diffusion Plant (PGDP)
Docket No. 70-7001 Safety Analysis Report Update - Modifications to C-310 and C-315 Normetex Pump High Discharge Pressure Shutdown Systems
Dear Dr. Paperiello:
By letter dated October 31,1997 (see the Reference), USEC submitted a certificate amendment request containing the Safety Analysis Report Update (SARUP) required by Issue 2 of DOE /ORO-2026, " Plan for Achieving Compliance with NRC Regulations at the Paducah Gaseous Diffusion Plant" (the Compliance Plan) for NRC review and approval. USEC's October 31,1997 letter contained the following commitment:
The Normetex pump high discharge pressure shutdown systems (HDPSSs) used in the product (C-310) and tails (C-315) withdrawal facilities are designed to detect high discharge pressure and trip the associated pumps to minimize the likelihood of a UF. release that could be caused by a primary system pressure excursion. The HDPSS in C-310 requires instrument air for the discharge pressure transmitters to detect high pressure in the discharge piping and initiate a shutdown. Similarly, the HDPSS in C-315 requires 24-VDC for the pressure transducers used in the system to properly opetate. The DOE SAR Upgrade identified that a postulated loss of instrument air in C-310 or 24-VDC iu C-315 would prevent the associated HDPSS from detecting a pressure excu;sion and initiating a pump shutdown. Means of ensuring the HDPSS is provided with necessary support systems (e.g., supervised control circuits) or precluding pump operation upon loss of needed support systems will be investigated to identify appropriate system equipment modifications. The
]
results of an engineering evaluation of the design / operation, a schedule for implementing recommended modifications, and any necessary changes to the
',j SARUP will be submitted to the NRC by March 9,1998.
yh 9003180006 980309 P
PDR ADOCK 07007001 PDR ggljlllhlhll
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- m,medge Drive, Bethesda. MD 20817-1818 Telephone 301-564-3200 Fax 301-564-3201 http://www.usec.com OMces in Livermore, CA Paducah, KY Portsmouth, OH Washington, DL
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.Dr. Carl J. Paperiello
- Ma'rch 9, l'998 GDP 98-0038, Page 2
- In accordance with this commitment, an engineering evaluation of the C-310 and C-315 Normetex Pump High Discharge Pressure Shutdown Systems has been performed. The results of that
' evaluation are summarized in Enclosure 1. Based on the results of the engineering evaluation, j
modifications to resolve the SARUP-identified deficiencies in the C-310 and C-315 Normetex Pump l
' High Discharge Pressure Shutdown Systems will be implemented by May 31,2001.
I Any questions regarding this matter should be directed to Steve Routh at (301) 564-3251 or myself at (301) 564-3250. Commitments contained in this submittal are identified in Enclosure 2.
Sincerely,
- 5. D. fd.Ag Steven A.Toelle t
. Nuclear Regulatory Assurance and Policy Manager
]
Reference:
Letter from James H. Miller (USEC) to Dr. Carl J. Paperiello (NRC), " Certificate Amendment Request - Update the Application Safety Analysis Report," Paducah Gaseous Diffusion Plant, Letter No. GDP 97-0188, October 31,1997.
Enclosures:
1.
Evaluation of C-310 and C-315 Normetex Pump High Discharge Pressure Shutdown Systems 2.
Commitments Contained in this Submittal cc:
Mr. Robert C. Pierson, NRC-HQ NRC Region III Office NRC Resident Inspector - PGDP NRC Resident Inspector-PORTS
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GDP 98-0038 Page 1 of 4 Evaluation of C-310 and C-315 Normetex Pump High Discharge Pressure Shutdown Systems SARUP Commitment Item 13 of Table 1 of USEC Letter GDP 97-0188 dated October 31,1998 states:
C-310 and C-315 Normetex Pump High Discharge Pressure Shutdown Systems The Normetex pump high discharge pressure shutdown systems (HDPSSs) used in the product (C-310) and tails (C-315) withdrawal facilities are designed to detect high discharge pressure and trip the associated pumps to minimize the likelihood of a UF release that could be caused by a primary system pressure excursion. The 6
HPDSS in C-310 requires instrument air for the discharge pressure transmitters to detect high pressure in the discharge piping and initiate a shutdown. Similarly, the HDPSS in C-315 requires 24-VDC for the pressure transducers used in the system to properly operate. The DOE SAR Upgrade identified that a postulated loss of instrument air in C-310 or 24-VDC in C-315 would prevent the associated HDPSS from detecting a pressure excursion and initiating a pump shutdown. Means of ensuring the HDPSS is provided with necessary support systems (e.g., supervised control circuits) or precluding pump operation upon loss of needed support systems will be investigated to identify appropriate system / equipment modifications. The results of an engineering evaluation of the design / operation, a schedule for implementing recommended modifications, and any necessary changes to the SARUP will be submitted to the NRC by March 9,1998.
Results of Engineering Evaluation Engineering drawings 15E-15944-C and 15E-15715-C were reviewed to examine the instrument system diagrams for the HDPSSs associated with the East and West Normetex pumps, respectively, in C-310. Review of the system diagrams revealed that the independent, absolute pressure transmitters monitoring the discharge side of each Normetex pump have a single supply of instrument air.
Failure of the common instrument air supply could disable the HDPSS.
Furthermore, the instrument air supply is not automatically supervised so its loss and subser,uent failure of the HDPSS may not be apparent to the C-310 operators. However, loss of this air mpply would most likely result in automatic shutdown of the Normetex pump due to closure of the discharge block valve which is configured to close automatically upon loss ofits air supply.
Engineering drawings E5E-16718-P and -R, and I5E-16718-Z were reviewed to examine the ?4, VDC power supply circuits for the absolute pressure transmitters in the HDPSSs associated with the three Normetex pumps in C-315. Presently, there are two, independent DC power supplies that are connected through isolation diodes to provide 24-VDC power for the three sets ofindependent
I
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GDP 98-0038 -
Page 2 0f 4 i
pressure transmitters monitoring the discharge side of each Normetex pump. Failure of one DC power supply will not disable the HDPSS. However, a fault in the common AC clectrical circuit,
~ which supplies both DC power supplies, could result in loss of HDPSS protection for all three of the
- Normetex pumps. A fault in the common AC electrical circuit will be annunciated in the C-315 -
Area Control Room by a diagnostic alarm on the Micromax microprocessor-based, multi-function
(
= process control and monitoring system since Micromax Local Processing Unit SS-1 receives power from the same circuit breaker. Loss of only one DC power supply will not be known until the system is checked by Maintenance during routine surveillance or other maintenance activities.
I The conclusions of the engineering evaluation are that the pneumatic presmre transmitters associated I
with the East and West Normetex pumps in C-310 should be replace-with electronic pressure I
transmitters which will be supplied by two independent DC power supplies, each connected to separate electrical circuit breakers for AC power. In addition, two separate AC power circuits should be provided for the DC power supplies in C-315.
Schedule The recommended modifications to the Normetex pump high discharge pressure shutdown systems (HDPSSs) in the product (C-310) and tails (C-315) withdrawal facilities will be completed by May 31,2001. Upon completion of the modifications, Section 3.15.4.7.3 of the SARUP will be revised to read as follows:
J 3.15.4.7.3 System Evaluation The Normetex pump HDPSS was evaluated to assess its ability to accomplish the required safety functions. In addition, a qualitative fault tree analysis was performed to determine the capability of the systen. to accomplish the safety functions. The results of these analyses are provided in this section.
Safety function analysis. The safety function of the system is to detect high discharge pressure and trip the associated pump to minimize the likelihood of a release of UF. caused by a UF. primary system pressure excursion. Breaching the UP. primary system would allow a release of UF.. The weak point in the withdrawal system piping is the Normetex pump expansion joint. The expansion joint is rated at 45 psia (310 kPa).
The system is designed to initiate pump shutdown if the pressure in the discharge piping reaches 42 psia (290 kPa).
The-mgnal bctwccedischargc picesurc vansmittcts end thc picassre1 witches-for theWerrscicx puu.,,e is e pncunie;.c signeMn-the-G310 product withdrawal-facility-The dischergc piaerc i.ar-o.ais icquirc instrunics: eir-tc cpsie:c. Less of-instrument-air will preven; the-HDPSS-fiein ini;;e;ing pan.p shu:dswn.- Thcicforc, ins;rument-ait-is required-forihe-HDPSS te prepcrly de:cci high picassrc irrthe-G310Hormete imo.,,'s did.ergc piping end insie:c punip shs: dews.- Thc Nernic:ex pumps-will s:sp cpcreting upes :hc less 48 VAC end 480 VAC cicctric pcwcr; m,,~~..ources-arc not nccacd tc.. src :hc aefcty fsec;iarofihewDPSSinG310:
GDP 98-0038 Page 3 of 4 The-C-315-HDPSS-utilizcs clce;ienic ceniscis-(he., picassic transmittersPthat scquirc 24-VDC pcwcr to cpcie:c. Loss of 24-VDC pcwcr wilt eausc :!r astps: of thc j
pressuretransmitters-to-bccen.c acgativc, picventing :hc pic ure-switchc3. rom initiating i
a pn.ny shs:dewn. The-24-VDC power supplies-are-rcyniscd-for-theHDPSSic picycrly detect high picosure-irrtpump'-s4ischargc piping and-initiate ym..y...m Several cen;ys.x..;. in :hc G-315-HDPSSwire-li5-VAC pcwcr to epcre c.
- Although40ss-of-HS-VAC pcwcr will-result-m-failure-ofdherressure-transmitters-and switchcs, :hc associated-relay-contactsMi-trensfcr cicscd, initie:ing a pump shutdcwn.
Thcicfccc, :hc IIDPSS-fails-in-a-safc mcdc en loss-of+15-VAC. Thc Normc:cx punips wilt-s:cp opcre:Ing spcn thc l css 48-VAG-and-480--VAC cicc:ric pcwcs, thu6 power sourccs arc not nccdcd-tertnsure-themafety-functiendthe-HDPSSinG315:
The C-310 and C-315 HDPSS utilize two, independent electronic control loops for each Normetex pump that require 115-VAC and 24-VDC power to operate.
The 115-VAC primary electrical power is provided from a single source through separate circuit breakers for the two independent control systems. Loss of the 115-VAC power will result in failure of both 24-VDC electronic control systems, however the associated failsafe alarm / shutdown relay contacts will close, initiating a pump shutdown. Therefore, the HDPSS fails in a safe mode on loss of 115-VAC.
Each of the two, independent HDPSS control loops for the Normetex pumps in C-310 and C-315 have dedicated 24-VDC electrical power supplies. Loss of 24-VDC power will cause the output of the electronic pressure transmitters to become negative, preventing the associated pressure switches in the control loop from initiating a pump shutdown. The 24-VDC power supplies are required for the HDPSS to properly detect high pressure in a pump's discharge piping and initiate pump shutdown. A failure of a 24-VDC power supply or any failure which causes a loss of the HDPSS will result in an annunciated TROUBLE alarm in the Area Control Room. If both control loops initiate TROUBLE alarms, then the HDPSS executes a pump shutdown.
l Other electrical power circuits associated with the HDPSS are 48-VAC and j
480-VAC. Since the Normetex pumps will stop operating upon the loss of 48-VAC and 480-VAC electrical power, these power sources are not needed to ensure the safety function of the HDPSS in C-310 and C-315.
In addition, page 5 of Table 3.15-2 of the SARUP will be revised to read as shown on the following page.
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. Enclosure 2 GDP 98-0038 Page1of3 Commitments Contained in this Submittal 1.-
The recommended modifications to the Normetex pump high discharge pressure shutdown systems (HDPSSs) in the product (C-310) and tails (C-315) withdrawal facilities will be completed by May 31,2001. Upon completion of the modifications, Section 3.15.4.7.3 of it SARUP will be revised to read as follows:
3.15.4.7.3 Sy=*a= Evaluation The Normetex pump HDPSS was evaluated to assess its ability to accomplish the required safety functions. In addition, a qualitative fault tree analysis was performed to determine the capability of the system w accomplish the safety functions. The results of these analyses are provided in this section.
Safety function analysis. The safety function of the system is to detect high discharge pressure and trip the associated pump to minimize the likelihood of a release of UF caused by a UF. primary system 6
pressure excursion. Breaching the UF primary system would allow a 6
release of UF. The weak point in the withdrawal system piping is the Normetex pump expansion joint. The expansion joint is rated at 45 psia (310 kPa). The system is designed to initiate pump shutdown if the pressure in the discharge piping reaches 42 psia (290 kPa).
The-signal-between-tlischargc prcessrc transmitters and the pressure-switches-for thc Normetex-punips is a pncunietic-signaHn-the C~310 piudsct withdrawal-facility-Thc discharge picssure-transmitters require-mstrument air to cpcretc. Losr-ofinstrumentair-willpreventihe HDPSS-from-mitiating punie hutdown. Therefore;-instmment-air-is s
required-for-the41DPSS-to picpcily-<letect4tigh pressure-irt-the-G410 Normetex psnip's discharge piping-and-tnitiac purnp shutdown-The -
Nernictcx psmes will-stop Opcreting upon thc l css 48 VAC-and480-VAG electric pcwns, thus, pcwct-sources-arc not nccdcd to-ensure-the-safety function of-the-HDPSSirrG310:
The-C~315-HDPSS-utilizes-electronie-controit-(i.c., picssure transmittersFthat icquirc 24-VDC power-to-operatc.. Loss of-24-VDG power-will cessc tus umym un me pressurc trenssiitters-to-become negativc, picycnting thc picssurc switches-from-tnitiating a panip shutdown. The-24-VDC pcwcr supplies-are-scquiredfor-the-HDPSS-to properly dctcet high picssure-in a punip'secharge piping and-initiate pun.p shutdown.
Several cuingencnts iniheG-315-H DPSSrrequirei 15-VAGpower to cporetc. Althoughiossmf-li5-VAC pcwcr will1resultin-failureef-the
+
GDP 98-0038 Page 2 of 3 picssurc treranii::crs and swi;chcs, the associe:cd sciey contacts-will trarafer ciescd, initiating a punip shutdown. Thcicierc, thc IIDPSrS-fails in a safc inedc en isss of H5-VAC. Thc Nernictex punips will-stop epsienng spen thc icas 48 VAG-and-480-VAC-electrie powert-thus, power-sources-arc not accded to ensurc :hc safc:y fbaction of nic HDPSS in-G 3 E The C-310 and C-315 HDPSS utilize two, independent electronic control loops for each Normetex pump that require 115-VAC and 24-VDC power to operate. The 115-VAC primary electrical power is provided from a single source through separate circuit breakers for the two independent control systems. Loss of the 115-VAC power will result in failure of both 24-VDC electronic control systems, however the associated failsafe alarm / shutdown relay contacts will close, initiating a pump shutdown. Therefore, the HDPSS fail in a safe mode on loss of 115-VAC.
Each of the two, independent HDPSS control loops for the Normetex pumps in C-310 and C-315 have dedicated 24-VDC electrical power supplies. Loss of 24-VDC power will cause the output of the electronic pressure transmitters to become negative, preventing the associated pressure switches in the control loop from initiating a pump shutdown. The 24-VDC power supplies are required for the HDPSS to properly detect high pressure in a pump's discharge piping and initiate pump shutdown. A failure of a 24 VDC power supply or any failure which causes a loss of the HDPSS will result in an annunciated TROUBLE alarm in the Area Control Room.
If both control loops initiate TROUBLE alarms, then the HDPSS executes a pump shutdown.
Other electrical power circuits associated with the HDPSS are 48-VAC and 480-VAC. Since the Normetex pumps will stop operating upon the loss of 48-VAC and 480-VAC electdcal power, these power sources are not needed to ensure the safety function of the HDPSS in C-310 and C-315.
In addition, page 5 of Table 3.15-2 of the SARUP will be revised to read as shown on the following page.
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